Fatal error: Uncaught Error: Interface 'Illuminate\Contracts\Broadcasting\Broadcaster' not found in E:\xampp\htdocs\www\yunwei\qr2500\vendor\laravel\framework\src\Illuminate\Broadcasting\Broadcasters\Broadcaster.php:18 Stack trace: #0 {main} thrown in E:\xampp\htdocs\www\yunwei\qr2500\vendor\laravel\framework\src\Illuminate\Broadcasting\Broadcasters\Broadcaster.php on line 18