diff --git a/packages/hydrooj/package.json b/packages/hydrooj/package.json
index a38286534..38fc5069a 100644
--- a/packages/hydrooj/package.json
+++ b/packages/hydrooj/package.json
@@ -1,6 +1,6 @@
 {
     "name": "hydrooj",
-    "version": "4.2.10",
+    "version": "4.2.11",
     "bin": "bin/hydrooj.js",
     "main": "src/plugin-api",
     "module": "src/plugin-api",
diff --git a/packages/hydrooj/src/interface.ts b/packages/hydrooj/src/interface.ts
index 81fffa2d7..2ec3cef2b 100644
--- a/packages/hydrooj/src/interface.ts
+++ b/packages/hydrooj/src/interface.ts
@@ -695,7 +695,7 @@ export interface Lib extends Record<string, any> {
     problemSearch: ProblemSearch;
 }
 
-export type UIInjectableFields = 'ProblemAdd' | 'Nav' | 'UserDropdown' | 'DomainManage' | 'ControlPanel';
+export type UIInjectableFields = 'ProblemAdd' | 'Notification' | 'Nav' | 'UserDropdown' | 'DomainManage' | 'ControlPanel';
 export interface UI {
     template: Record<string, string>,
     nodes: Record<UIInjectableFields, any[]>,
diff --git a/packages/hydrooj/src/loader.ts b/packages/hydrooj/src/loader.ts
index a549c97ac..8a7e23c1d 100644
--- a/packages/hydrooj/src/loader.ts
+++ b/packages/hydrooj/src/loader.ts
@@ -16,6 +16,8 @@ import { Logger } from './logger';
 import { Context } from './context';
 // eslint-disable-next-line import/no-duplicates
 import { unwrapExports } from './utils';
+import { PRIV } from './model/builtin';
+import { inject } from './lib/ui';
 
 const argv = cac().parse();
 const logger = new Logger('loader');
@@ -95,6 +97,7 @@ export function addon(addonPath: string, prepend = false) {
     } catch (e) {
         logger.error(`Addon not found: ${addonPath}`);
         logger.error(e);
+        inject('Notification', 'Addon not found: {0}', { args: [addonPath] }, PRIV.PRIV_VIEW_SYSTEM_NOTIFICATION);
     }
 }
 
diff --git a/packages/ui-default/package.json b/packages/ui-default/package.json
index a762e3fee..e7b3eba05 100644
--- a/packages/ui-default/package.json
+++ b/packages/ui-default/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@hydrooj/ui-default",
-  "version": "4.42.8",
+  "version": "4.42.9",
   "author": "undefined <i@undefined.moe>",
   "license": "AGPL-3.0",
   "main": "index.ts",
diff --git a/packages/ui-default/templates/layout/basic.html b/packages/ui-default/templates/layout/basic.html
index 379177872..4304b0c4a 100644
--- a/packages/ui-default/templates/layout/basic.html
+++ b/packages/ui-default/templates/layout/basic.html
@@ -6,6 +6,9 @@
   <div class="slideout-overlay"></div>
   {% if UserContext %}{% include "partials/header_mobile.html" %}{% endif %}
   <div class="main">
+    {% for item in ui.getNodes('Notification') %}{% if item.checker(handler) %}
+      <div class="row"><blockquote class="warn">{{ _(item.name).format(item.args.args or []) }}</blockquote></div>
+    {% endif %}{% endfor %}
     {% block content %}{% endblock %}
   </div>
   {% include "partials/footer.html" %}