Fatal error: Uncaught Error: Class "Nette\InvalidStateException" not found in /home/winnie/public_html/yahya/app-scheduler/vendor/nette/schema/src/Schema/ValidationException.php:16 Stack trace: #0 {main} thrown in /home/winnie/public_html/yahya/app-scheduler/vendor/nette/schema/src/Schema/ValidationException.php on line 16