Fatal error: Uncaught Error: Class "Symfony\Contracts\EventDispatcher\Event" not found in /home/astechc1/public_html/vendor/helios-ag/fm-elfinder-bundle/src/Event/ElFinderPreExecutionEvent.php:9 Stack trace: #0 {main} thrown in /home/astechc1/public_html/vendor/helios-ag/fm-elfinder-bundle/src/Event/ElFinderPreExecutionEvent.php on line 9