Fatal error: Uncaught Error: Class "Nette\InvalidStateException" not found in /home/wwwarms/ws.arms-tools.com/websocket-server/vendor/nette/schema/src/Schema/ValidationException.php:18 Stack trace: #0 {main} thrown in /home/wwwarms/ws.arms-tools.com/websocket-server/vendor/nette/schema/src/Schema/ValidationException.php on line 18