Fatal error: Uncaught Error: Class "Illuminate\Support\MultipleInstanceManager" not found in D:\xampp\htdocs\trading_temp\vendor\laravel\framework\src\Illuminate\Concurrency\ConcurrencyManager.php:15 Stack trace: #0 {main} thrown in D:\xampp\htdocs\trading_temp\vendor\laravel\framework\src\Illuminate\Concurrency\ConcurrencyManager.php on line 15