laravel8 Class "Encore\Admin\Assets" not found

[duolabmeng6]

composer require laravel-admin-ext/wang-editor
Using version ^2.0 for laravel-admin-ext/wang-editor

\vendor\laravel-admin-ext\wang-editor\src\WangEditorServiceProvider.php:24
     20▕         if ($views = $extension->views()) {
     21▕             $this->loadViewsFrom($views, 'laravel-admin-wangEditor');
     22▕         }
     23▕
  ➜  24▕         Assets::define('wangEditor', [
     25▕             'js'     => 'https://cdn.jsdelivr.net/npm/wangeditor@3.1.1/release/wangEditor.min.js',
     26▕             'export' => 'wangEditor',
     27▕         ]);
     28▕