diff --git a/addons/test_website/static/tests/tours/error_views.js b/addons/test_website/static/tests/tours/error_views.js
index de6f69b68f7..b0a7b1422a4 100644
--- a/addons/test_website/static/tests/tours/error_views.js
+++ b/addons/test_website/static/tests/tours/error_views.js
@@ -49,8 +49,8 @@ tour.register('test_error_website', {
         trigger: 'a[href="/test_internal_error_json"]',
     }, {
         content: "rpc error 500 modal is an ErrorDialog",
-        extra_trigger: 'div.o_dialog_error.modal-body div.alert.alert-warning',
-        trigger: 'button.btn.btn-primary[type="button"]',
+        extra_trigger: 'div.o_dialog_error.modal-content div.alert.alert-warning',
+        trigger: '.modal-footer button.btn.btn-primary',
     },
     // HTTP ERROR
     {
diff --git a/addons/web/__manifest__.py b/addons/web/__manifest__.py
index 3147f685333..0e644190f16 100644
--- a/addons/web/__manifest__.py
+++ b/addons/web/__manifest__.py
@@ -205,6 +205,7 @@ This module provides the core of the Odoo Web Client.
             # TODO: split debug files correctly when converting frontend debug
             # manager so we don't need action-service and stuff
             ('remove', 'web/static/src/core/debug/**/*'),
+            'web/static/src/public/error_notifications.js',
 
             'web/static/src/legacy/scss/base_frontend.scss',
             'web/static/src/legacy/scss/lazyloader.scss',
@@ -219,6 +220,8 @@ This module provides the core of the Odoo Web Client.
             'web/static/src/legacy/js/public/public_root.js',
             'web/static/src/legacy/js/public/public_root_instance.js',
             'web/static/src/legacy/js/public/public_widget.js',
+            'web/static/src/legacy/legacy_promise_error_handler.js',
+            'web/static/src/legacy/legacy_rpc_error_handler.js',
 
             ('include', 'web.frontend_legacy'),
         ],
diff --git a/addons/web/static/src/core/errors/error_dialogs.js b/addons/web/static/src/core/errors/error_dialogs.js
index 5a3fb213b2f..a249335f66b 100644
--- a/addons/web/static/src/core/errors/error_dialogs.js
+++ b/addons/web/static/src/core/errors/error_dialogs.js
@@ -10,13 +10,19 @@ import { capitalize } from "../utils/strings";
 const { hooks } = owl;
 const { useState } = hooks;
 
-const odooExceptionTitleMap = new Map();
-
-odooExceptionTitleMap.set("odoo.exceptions.AccessDenied", _lt("Access Denied"));
-odooExceptionTitleMap.set("odoo.exceptions.AccessError", _lt("Access Error"));
-odooExceptionTitleMap.set("odoo.exceptions.MissingError", _lt("Missing Record"));
-odooExceptionTitleMap.set("odoo.exceptions.UserError", _lt("User Error"));
-odooExceptionTitleMap.set("odoo.exceptions.ValidationError", _lt("Validation Error"));
+export const odooExceptionTitleMap = new Map(
+    Object.entries({
+        "odoo.addons.base.models.ir_mail_server.MailDeliveryException": _lt(
+            "MailDeliveryException"
+        ),
+        "odoo.exceptions.AccessDenied": _lt("Access Denied"),
+        "odoo.exceptions.MissingError": _lt("Missing Record"),
+        "odoo.exceptions.UserError": _lt("User Error"),
+        "odoo.exceptions.ValidationError": _lt("Validation Error"),
+        "odoo.exceptions.AccessError": _lt("Access Error"),
+        "odoo.exceptions.Warning": _lt("Warning")
+    })
+);
 
 // -----------------------------------------------------------------------------
 // Generic Error Dialog
diff --git a/addons/web/static/src/core/notifications/notification.js b/addons/web/static/src/core/notifications/notification.js
index 64cc6919e7c..e5fbd0c24a6 100644
--- a/addons/web/static/src/core/notifications/notification.js
+++ b/addons/web/static/src/core/notifications/notification.js
@@ -40,13 +40,13 @@ Notification.props = {
             return (
                 typeof m === "string" || (typeof m === "object" && typeof m.toString === "function")
             );
-        },
+        }
     },
-    title: { type: [String, Boolean], optional: true },
+    title: { type: [String, Boolean, { toString: Function }], optional: true },
     type: {
         type: String,
         optional: true,
-        validate: (t) => ["warning", "danger", "success", "info"].includes(t),
+        validate: (t) => ["warning", "danger", "success", "info"].includes(t)
     },
     messageIsHtml: { type: Boolean, optional: true },
     className: { type: String, optional: true },
@@ -58,15 +58,15 @@ Notification.props = {
                 name: { type: String },
                 icon: { type: String, optional: true },
                 primary: { type: Boolean, optional: true },
-                onClick: Function,
-            },
-        },
+                onClick: Function
+            }
+        }
     },
-    onClose: { type: Function, optional: true },
+    onClose: { type: Function, optional: true }
 };
 Notification.defaultProps = {
     buttons: [],
     className: "",
     messageIsHtml: false,
-    type: "warning",
+    type: "warning"
 };
diff --git a/addons/web/static/src/legacy/frontend/public_crash_manager/public_crash_manager.js b/addons/web/static/src/legacy/frontend/public_crash_manager/public_crash_manager.js
deleted file mode 100644
index a9942498278..00000000000
--- a/addons/web/static/src/legacy/frontend/public_crash_manager/public_crash_manager.js
+++ /dev/null
@@ -1,398 +0,0 @@
-odoo.define('web.CrashManager', function (require) {
-    "use strict";
-
-    const AbstractService = require('web.AbstractService');
-    var ajax = require('web.ajax');
-    var core = require('web.core');
-    var Dialog = require('web.Dialog');
-    var Widget = require('web.Widget');
-    var config = require('web.config');
-    var { formatTraceback, annotateTraceback } = require("@web/legacy/js/core/error_utils");
-
-    var _t = core._t;
-    var _lt = core._lt;
-
-    // Register this eventlistener before qunit does.
-    // Some errors needs to be negated by the crash_manager.
-    window.addEventListener('unhandledrejection', ev =>
-        core.bus.trigger('crash_manager_unhandledrejection', ev)
-    );
-
-    let active = true;
-
-    /**
-     * An extension of Dialog Widget to render the warnings and errors on the website.
-     * Extend it with your template of choice like ErrorDialog/WarningDialog
-     */
-    var CrashManagerDialog = Dialog.extend({
-        xmlDependencies: (Dialog.prototype.xmlDependencies || []).concat(
-            ['/web/static/src/legacy/frontend/public_crash_manager/public_crash_manager.xml']
-        ),
-
-        /**
-         * @param {Object} error
-         * @param {string} error.message    the message in Warning/Error Dialog
-         * @param {string} error.traceback  the traceback in ErrorDialog
-         *
-         * @constructor
-         */
-        init: function (parent, options, error) {
-            this._super.apply(this, [parent, options]);
-            this.error = error;
-            this.message = error.message;
-            this.traceback = error.traceback;
-            core.bus.off('close_dialogs', this);
-        },
-
-        willStart: async function () {
-            await this._super()
-            const jsError = this.error.data && this.error.data.jsError;
-            if (jsError) {
-                if (config.isDebug('assets')) {
-                    this.traceback = await annotateTraceback(jsError);
-                } else {
-                    this.traceback = formatTraceback(jsError);
-                }
-            }
-        },
-
-        start: async function () {
-            await this._super();
-            const message = this.message;
-            const traceback = this.traceback;
-
-            if (!traceback) {
-                return;
-            }
-            this.$(".o_error_detail").on("shown.bs.collapse", function (e) {
-                e.target.scrollTop = e.target.scrollHeight;
-            });
-
-            const $clipboardBtn = this.$(".o_clipboard_button");
-            $clipboardBtn.tooltip({title: _t("Copied !"), trigger: "manual", placement: "left"});
-            this.clipboard = new window.ClipboardJS($clipboardBtn[0], {
-                text: function () {
-                    return (_t("Error") + ":\n" + message + "\n\n" + traceback).trim();
-                },
-                // Container added because of Bootstrap modal that give the focus to another element.
-                // We need to give to correct focus to ClipboardJS (see in ClipboardJS doc)
-                // https://github.com/zenorocha/clipboard.js/issues/155
-                container: this.el,
-            });
-            this.clipboard.on("success", function (e) {
-                _.defer(function () {
-                    $clipboardBtn.tooltip("show");
-                    _.delay(function () {
-                        $clipboardBtn.tooltip("hide");
-                    }, 800);
-                });
-            });
-        },
-        destroy() {
-            if (this.clipboard) {
-                this.$(".o_clipboard_button").tooltip('dispose');
-                this.clipboard.destroy();
-            }
-            this._super();
-        }
-    });
-
-    var ErrorDialog = CrashManagerDialog.extend({
-        template: 'CrashManager.error',
-    });
-
-    var WarningDialog = CrashManagerDialog.extend({
-        template: 'CrashManager.warning',
-
-        /**
-         * Sets size to medium by default.
-         *
-         * @override
-         */
-        init: function (parent, options, error) {
-            this._super(parent, _.extend({
-                size: 'medium',
-           }, options), error);
-        },
-
-        //--------------------------------------------------------------------------
-        // Public
-        //--------------------------------------------------------------------------
-
-        /**
-         * Focuses the ok button.
-         *
-         * @override
-         */
-        open: function () {
-            this._super({shouldFocusButtons: true});
-        },
-    });
-
-    var CrashManager = AbstractService.extend({
-        init: function () {
-            var self = this;
-            active = true;
-            this.isConnected = true;
-            this.odooExceptionTitleMap = {
-                'odoo.addons.base.models.ir_mail_server.MailDeliveryException': _lt("MailDeliveryException"),
-                'odoo.exceptions.AccessDenied': _lt("Access Denied"),
-                'odoo.exceptions.AccessError': _lt("Access Error"),
-                'odoo.exceptions.MissingError': _lt("Missing Record"),
-                'odoo.exceptions.UserError': _lt("User Error"),
-                'odoo.exceptions.ValidationError': _lt("Validation Error"),
-                'odoo.exceptions.Warning': _lt("Warning"),
-            };
-
-            this._super.apply(this, arguments);
-
-            // crash manager integration
-            core.bus.on('rpc_error', this, this.rpc_error);
-            window.onerror = function (message, file, line, col, error) {
-                // Scripts injected in DOM (eg: google API's js files) won't return a clean error on window.onerror.
-                // The browser will just give you a 'Script error.' as message and nothing else for security issue.
-                // To enable onerror to work properly with CORS file, you should:
-                //   1. add crossorigin="anonymous" to your <script> tag loading the file
-                //   2. enabling 'Access-Control-Allow-Origin' on the server serving the file.
-                // Since in some case it wont be possible to to this, this handle should have the possibility to be
-                // handled by the script manipulating the injected file. For this, you will use window.onOriginError
-                // If it is not handled, we should display something clearer than the common crash_manager error dialog
-                // since it won't show anything except "Script error."
-                // This link will probably explain it better: https://blog.sentry.io/2016/05/17/what-is-script-error.html
-                if (!file && !line && !col) {
-                    // Chrome and Opera set "Script error." on the `message` and hide the `error`
-                    // Firefox handles the "Script error." directly. It sets the error thrown by the CORS file into `error`
-                    if (window.onOriginError) {
-                        window.onOriginError();
-                        delete window.onOriginError;
-                    } else {
-                        self.show_error({
-                            type: _t("Odoo Client Error"),
-                            message: _t("Unknown CORS error"),
-                            data: {debug: _t("An unknown CORS error occured. The error probably originates from a JavaScript file served from a different origin. (Opening your browser console might give you a hint on the error.)")},
-                        });
-                    }
-                } else {
-                    // ignore Chrome video internal error: https://crbug.com/809574
-                    if (!error && message === 'ResizeObserver loop limit exceeded') {
-                        return;
-                    }
-                    var traceback = error ? error.stack : '';
-                    self.show_error({
-                        type: _t("Odoo Client Error"),
-                        message: message,
-                        data: {debug: file + ':' + line + "\n" + _t('Traceback:') + "\n" + traceback, jsError: error},
-                    });
-                }
-            };
-
-            // listen to unhandled rejected promises, and throw an error when the
-            // promise has been rejected due to a crash
-            core.bus.on('crash_manager_unhandledrejection', this, function (ev) {
-                if (ev.reason && ev.reason instanceof Error) {
-                    let traceback = ev.reason.stack;
-                    self.show_error({
-                        type: _t("Odoo Client Error"),
-                        message: '',
-                        data: {debug: _t('Traceback:') + "\n" + traceback, jsError: ev.reason},
-                    });
-                } else {
-                    // the rejection is not due to an Error, so prevent the browser
-                    // from displaying an 'unhandledrejection' error in the console
-                    ev.stopPropagation();
-                    ev.stopImmediatePropagation();
-                    ev.preventDefault();
-                }
-            });
-        },
-        enable: function () {
-            active = true;
-        },
-        disable: function () {
-            active = false;
-        },
-        handleLostConnection: function () {
-            var self = this;
-            if (!this.isConnected) {
-                // already handled, nothing to do.  This can happen when several
-                // rpcs are done in parallel and fail because of a lost connection.
-                return;
-            }
-            this.isConnected = false;
-            var delay = 2000;
-            core.bus.trigger('connection_lost');
-
-            setTimeout(function checkConnection() {
-                ajax.jsonRpc('/web/webclient/version_info', 'call', {}, {shadow:true}).then(function () {
-                    core.bus.trigger('connection_restored');
-                    self.isConnected = true;
-                }).guardedCatch(function () {
-                    // exponential backoff, with some jitter
-                    delay = (delay * 1.5) + 500*Math.random();
-                    setTimeout(checkConnection, delay);
-                });
-            }, delay);
-        },
-        rpc_error: function(error) {
-            // Some qunit tests produces errors before the DOM is set.
-            // This produces an error loop as the modal/toast has no DOM to attach to.
-            if (!document.body || !active || this.connection_lost) return;
-
-            // Connection lost error
-            if (error.code === -32098) {
-                this.handleLostConnection();
-                return;
-            }
-
-            // Special exception handlers, see crash_registry bellow
-            var handler = core.crash_registry.get(error.data.name, true);
-            if (handler) {
-                new (handler)(this, error).display();
-                return;
-            }
-
-            // Odoo custom exception: UserError, AccessError, ...
-            if (_.has(this.odooExceptionTitleMap, error.data.name)) {
-                error = _.extend({}, error, {
-                    data: _.extend({}, error.data, {
-                        message: error.data.arguments[0],
-                        title: this.odooExceptionTitleMap[error.data.name],
-                    }),
-                });
-                this.show_warning(error);
-                return;
-            }
-
-            // Any other Python exception
-            this.show_error(error);
-        },
-        show_warning: function (error, options) {
-            if (!active) {
-                return;
-            }
-            var message = error.data ? error.data.message : error.message;
-            var title = _t("Something went wrong !");
-            if (error.type) {
-                title = _.str.capitalize(error.type);
-            } else if (error.data && error.data.title) {
-                title = _.str.capitalize(error.data.title);
-            }
-
-            return this.displayNotification(Object.assign({}, options, {
-                title,
-                message,
-                sticky: true,
-            }));
-        },
-        show_error: function (error) {
-            if (!active) {
-                return;
-            }
-            error.traceback = error.data.debug;
-            var dialog = new ErrorDialog(this, {
-                title: _.str.capitalize(error.type) || _t("Odoo Error"),
-            }, error);
-
-            return dialog.open();
-        },
-        show_message: function(exception) {
-            return this.show_error({
-                type: _t("Odoo Client Error"),
-                message: exception,
-                data: {debug: ""}
-            });
-        },
-    });
-
-    /**
-     * An interface to implement to handle exceptions. Register implementation in instance.web.crash_manager_registry.
-    */
-    var ExceptionHandler = {
-        /**
-         * @param parent The parent.
-         * @param error The error object as returned by the JSON-RPC implementation.
-         */
-        init: function(parent, error) {},
-        /**
-         * Called to inform to display the widget, if necessary. A typical way would be to implement
-         * this interface in a class extending instance.web.Dialog and simply display the dialog in this
-         * method.
-         */
-        display: function() {},
-    };
-
-
-    /**
-     * Handle redirection warnings, which behave more or less like a regular
-     * warning, with an additional redirection button.
-     */
-    var RedirectWarningHandler = Widget.extend(ExceptionHandler, {
-        init: function(parent, error) {
-            this._super(parent);
-            this.error = error;
-        },
-        display: function() {
-            var self = this;
-            var error = this.error;
-            var additional_context = _.extend({}, this.context, error.data.arguments[3]);
-
-            new WarningDialog(this, {
-                title: _.str.capitalize(error.type) || _t("Odoo Warning"),
-                buttons: [
-                    {text: error.data.arguments[2], classes : "btn-primary", click: function() {
-                        self.do_action(
-                            error.data.arguments[1],
-                            {
-                                additional_context: additional_context,
-                            });
-                            self.destroy();
-                    }, close: true},
-                    {text: _t("Cancel"), click: function() { self.destroy(); }, close: true}
-                ]
-            }, {
-                message: error.data.arguments[0],
-            }).open();
-        }
-    });
-
-    core.crash_registry.add('odoo.exceptions.RedirectWarning', RedirectWarningHandler);
-
-    function session_expired(cm) {
-        return {
-            display: function () {
-                const notif = {
-                    type: _t("Odoo Session Expired"),
-                    message: _t("Your Odoo session expired. The current page is about to be refreshed."),
-                };
-                const options = {
-                    buttons: [{
-                        text: _t("Ok"),
-                        click: () => window.location.reload(true),
-                        close: true
-                    }],
-                };
-                cm.show_warning(notif, options);
-            }
-        };
-    }
-    core.crash_registry.add('odoo.http.SessionExpiredException', session_expired);
-    core.crash_registry.add('werkzeug.exceptions.Forbidden', session_expired);
-
-    core.crash_registry.add('504', function (cm) {
-        return {
-            display: function () {
-                cm.show_warning({
-                    type: _t("Request timeout"),
-                    message: _t("The operation was interrupted. This usually means that the current operation is taking too much time.")});
-            }
-        };
-    });
-    core.serviceRegistry.add('crash_manager', CrashManager);
-
-    return {
-        CrashManager: CrashManager,
-        ErrorDialog: ErrorDialog,
-        WarningDialog: WarningDialog,
-        disable: () => active = false,
-    };
-});
diff --git a/addons/web/static/src/legacy/frontend/public_crash_manager/public_crash_manager.xml b/addons/web/static/src/legacy/frontend/public_crash_manager/public_crash_manager.xml
deleted file mode 100644
index 50b4c126312..00000000000
--- a/addons/web/static/src/legacy/frontend/public_crash_manager/public_crash_manager.xml
+++ /dev/null
@@ -1,27 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<templates id="template" xml:space="preserve">
-
-<div t-name="CrashManager.warning" class="o_dialog_warning" role="alert">
-    <p t-esc="widget.message" style="white-space: pre-wrap;"/>
-</div>
-
-<div t-name="CrashManager.error" class="o_dialog_error">
-    <div class="alert alert-warning clearfix" role="alert">
-        <div class="float-right ml8 btn-group-vertical">
-            <button class="btn btn-primary o_clipboard_button">
-                <i class="fa fa-clipboard mr8"/>Copy the full error to clipboard
-            </button>
-        </div>
-        <p><b>An error occurred</b></p>
-        <p>Please use the copy button to report the error to your support service.</p>
-    </div>
-
-    <t t-set="errUID" t-value="_.uniqueId()"/>
-    <button class="btn btn-link" t-att-data-target="'#o_error_detail' + errUID" data-toggle="collapse">See details</button>
-    <div t-att-id="'o_error_detail' + errUID" class="collapse alert alert-danger o_error_detail" role="alert">
-        <pre t-esc="widget.message"/>
-        <pre t-esc="widget.traceback"/>
-    </div>
-</div>
-
-</templates>
diff --git a/addons/web/static/src/legacy/js/public/public_root.js b/addons/web/static/src/legacy/js/public/public_root.js
index 65c66496e44..28e0f183dad 100644
--- a/addons/web/static/src/legacy/js/public/public_root.js
+++ b/addons/web/static/src/legacy/js/public/public_root.js
@@ -17,6 +17,7 @@ import {
     makeLegacyRpcService,
     makeLegacySessionService,
     makeLegacyDialogMappingService,
+    mapLegacyEnvToWowlEnv,
 } from "../../utils";
 import { ComponentAdapter } from "web.OwlCompatibility";
 
@@ -370,13 +371,13 @@ export async function createPublicRoot(RootWidget) {
     serviceRegistry.add("legacy_rpc", makeLegacyRpcService(legacyEnv));
     serviceRegistry.add("legacy_session", makeLegacySessionService(legacyEnv, session));
     serviceRegistry.add("legacy_notification", makeLegacyNotificationService(legacyEnv));
-    serviceRegistry.add("legacy_crash_manager", makeLegacyCrashManagerService(legacyEnv));
     serviceRegistry.add("legacy_dialog_mapping", makeLegacyDialogMappingService(legacyEnv));
     await Promise.all([owl.utils.whenReady(), session.is_bound]);
 
     const wowlEnv = makeEnv();
     wowlEnv.qweb.addTemplates(await loadBundleTemplates("web.assets_frontend"));
     await startServices(wowlEnv);
+    mapLegacyEnvToWowlEnv(legacyEnv, wowlEnv);
 
     const adapter = new ComponentAdapter(null, { Component }); // Used for _trigger_up compat layer
     const publicRoot = new RootWidget(adapter);
diff --git a/addons/web/static/src/legacy/legacy_rpc_error_handler.js b/addons/web/static/src/legacy/legacy_rpc_error_handler.js
index 67a36606f88..fa00c3f51fd 100644
--- a/addons/web/static/src/legacy/legacy_rpc_error_handler.js
+++ b/addons/web/static/src/legacy/legacy_rpc_error_handler.js
@@ -4,6 +4,7 @@ import { registry } from "@web/core/registry";
 import { RPCErrorDialog } from "../core/errors/error_dialogs";
 import { RPCError } from "../core/network/rpc_service";
 
+const errorNotificationRegistry = registry.category("error_notifications");
 const errorDialogRegistry = registry.category("error_dialogs");
 const errorHandlerRegistry = registry.category("error_handlers");
 
@@ -39,8 +40,15 @@ function legacyRPCErrorHandler(env, error, originalError) {
         event.preventDefault();
         const exceptionName = originalError.exceptionName;
         let ErrorComponent = originalError.Component;
-        if (!ErrorComponent && exceptionName && errorDialogRegistry.contains(exceptionName)) {
-            ErrorComponent = errorDialogRegistry.get(exceptionName);
+        if (!ErrorComponent && exceptionName) {
+            if (errorNotificationRegistry.contains(exceptionName)) {
+                const notif = errorNotificationRegistry.get(exceptionName);
+                env.services.notification.add(notif.message || originalError.data.message, notif);
+                return true;
+            }
+            if (errorDialogRegistry.contains(exceptionName)) {
+                ErrorComponent = errorDialogRegistry.get(exceptionName);
+            }
         }
 
         env.services.dialog.add(ErrorComponent || RPCErrorDialog, {
@@ -51,7 +59,7 @@ function legacyRPCErrorHandler(env, error, originalError) {
             data: originalError.data,
             subType: originalError.subType,
             code: originalError.code,
-            type: originalError.type,
+            type: originalError.type
         });
         return true;
     }
diff --git a/addons/web/static/src/public/error_notifications.js b/addons/web/static/src/public/error_notifications.js
new file mode 100644
index 00000000000..195f6f4fd9e
--- /dev/null
+++ b/addons/web/static/src/public/error_notifications.js
@@ -0,0 +1,37 @@
+/** @odoo-module */
+// This module makes it so that some errors only display a notification instead of an error dialog
+
+import { registry } from "@web/core/registry";
+import { odooExceptionTitleMap } from "@web/core/errors/error_dialogs";
+import { _t } from "@web/core/l10n/translation";
+
+odooExceptionTitleMap.forEach((title, exceptionName) => {
+    registry.category("error_notifications").add(exceptionName, {
+        title: title,
+        type: "warning",
+        sticky: true
+    });
+});
+
+const sessionExpired = {
+    title: _t("Odoo Session Expired"),
+    message: _t("Your Odoo session expired. The current page is about to be refreshed."),
+    buttons: [
+        {
+            text: _t("Ok"),
+            click: () => window.location.reload(true),
+            close: true
+        }
+    ]
+};
+
+registry
+    .category("error_notifications")
+    .add("odoo.http.SessionExpiredException", sessionExpired)
+    .add("werkzeug.exceptions.Forbidden", sessionExpired)
+    .add("504", {
+        title: _t("Request timeout"),
+        message: _t(
+            "The operation was interrupted. This usually means that the current operation is taking too much time."
+        )
+    });
diff --git a/addons/website_forum/static/src/js/website_forum.js b/addons/website_forum/static/src/js/website_forum.js
index f3fca69f07a..8b5dec34d9c 100644
--- a/addons/website_forum/static/src/js/website_forum.js
+++ b/addons/website_forum/static/src/js/website_forum.js
@@ -246,11 +246,11 @@ publicWidget.registry.websiteForum = publicWidget.Widget.extend({
             msg = _t("Sorry you must be logged in to perform this action");
             title = _t("Access Denied");
         }
-        this.call('crash_manager', 'show_warning', {
+        this.displayNotification({
             message: msg,
             title: title,
-        }, {
             sticky: false,
+            type: "warning",
         });
     },
     /**
@@ -308,11 +308,11 @@ publicWidget.registry.websiteForum = publicWidget.Widget.extend({
                 } else if (data.error === 'post_non_flaggable') {
                     message = _t("This post can not be flagged");
                 }
-                self.call('crash_manager', 'show_warning', {
+                this.displayNotification({
                     message: message,
                     title: _t("Access Denied"),
-                }, {
                     sticky: false,
+                    type: "warning",
                 });
             } else if (data.success) {
                 var elem = $link;
@@ -348,11 +348,11 @@ publicWidget.registry.websiteForum = publicWidget.Widget.extend({
                 } else if (data.error === 'anonymous_user') {
                     message = _t('Sorry you must be logged to vote');
                 }
-                self.call('crash_manager', 'show_warning', {
+                this.displayNotification({
                     message: message,
                     title: _t("Access Denied"),
-                }, {
                     sticky: false,
+                    type: "warning",
                 });
             } else {
                 var $container = $btn.closest('.vote');
@@ -427,11 +427,11 @@ publicWidget.registry.websiteForum = publicWidget.Widget.extend({
                 if (data.error === 'anonymous_user') {
                     var message = _t("Sorry, anonymous users cannot choose correct answer.");
                 }
-                this.call('crash_manager', 'show_warning', {
+                this.displayNotification({
                     message: message,
                     title: _t("Access Denied"),
-                }, {
                     sticky: false,
+                    type: "warning",
                 });
             } else {
                 _.each(this.$('.forum_answer'), answer => {