Fatal error: Uncaught Error: Interface 'Illuminate\Contracts\Support\Renderable' not found in D:\svn\epic-site(사전예약)\default\vendor\encore\laravel-admin\src\Widgets\Navbar\Fullscreen.php:13 Stack trace: #0 {main} thrown in D:\svn\epic-site(사전예약)\default\vendor\encore\laravel-admin\src\Widgets\Navbar\Fullscreen.php on line 13