Fatal error: Uncaught Error: Class "Illuminate\Support\MultipleInstanceManager" not found in /var/www/html/app/vendor/laravel/framework/src/Illuminate/Concurrency/ConcurrencyManager.php:13 Stack trace: #0 {main} thrown in /var/www/html/app/vendor/laravel/framework/src/Illuminate/Concurrency/ConcurrencyManager.php on line 13