Laravel Backpack CRUD给出404无法加载资源

Question

我刚刚在Laravel项目中安装了Backpack。我按照步骤操作，但是出现404错误。

class PostCrudController extends CrudController
{
    public function setup()
    {
        /* CrudPanel Basic Information */

        $this->crud->setModel('App\Models\Post');
        $this->crud->setRoute(config('backpack.base.route_prefix') . '/post');
        $this->crud->setEntityNameStrings('post', 'posts');

        /* CrudPanel Configuration */

        // TODO: remove setFromDb() and manually define Fields and Columns
        $this->crud->setFromDb();

        // add asterisk for fields that are required in PostRequest
        $this->crud->setRequiredFields(StoreRequest::class, 'create');
        $this->crud->setRequiredFields(UpdateRequest::class, 'edit');
    }
}

custom.php路由

Route::group([
    'prefix' => config('backpack.base.route_prefix', 'admin'),
    'middleware' => ['web', config('backpack.base.middleware_key', 'admin')],
    'namespace' => 'App\Http\Controllers\Admin',
], function () { // custom admin routes
    CRUD::resource('Post', 'PostCrudController');
}); // this should be the absolute last line of this file

有人可以帮助我吗？