Fatal error: Uncaught Error: Class "Illuminate\Support\MultipleInstanceManager" not found in E:\install\laragon\www\18euniversitecaaf\vendor\laravel\framework\src\Illuminate\Concurrency\ConcurrencyManager.php:13 Stack trace: #0 {main} thrown in E:\install\laragon\www\18euniversitecaaf\vendor\laravel\framework\src\Illuminate\Concurrency\ConcurrencyManager.php on line 13