Fatal error: Uncaught Error: Class 'Symfony\Component\Debug\ExceptionHandler' not found in C:\xampp\htdocs\print-bk\vendor\symfony\debug\Tests\MockExceptionHandler.php:16 Stack trace: #0 {main} thrown in C:\xampp\htdocs\print-bk\vendor\symfony\debug\Tests\MockExceptionHandler.php on line 16