Fatal error: Uncaught Error: Class "Illuminate\Support\MultipleInstanceManager" not found in C:\wamp64\houda\vendor\laravel\framework\src\Illuminate\Concurrency\ConcurrencyManager.php:15 Stack trace: #0 {main} thrown in C:\wamp64\houda\vendor\laravel\framework\src\Illuminate\Concurrency\ConcurrencyManager.php on line 15