Fatal error: Uncaught Error: Class "Nette\InvalidStateException" not found in C:\Servers\htdocs\inventory.fitzalan.co.uk\vendor\nette\schema\src\Schema\ValidationException.php:18 Stack trace: #0 {main} thrown in C:\Servers\htdocs\inventory.fitzalan.co.uk\vendor\nette\schema\src\Schema\ValidationException.php on line 18