Fatal error: Uncaught Error: Class 'Nelmio\SecurityBundle\EventListener\AbstractContentTypeRestrictableListener' not found in /home/eberhardschwarze/public_html/vendor/nelmio/security-bundle/EventListener/ContentSecurityPolicyListener.php:28 Stack trace: #0 {main} thrown in /home/eberhardschwarze/public_html/vendor/nelmio/security-bundle/EventListener/ContentSecurityPolicyListener.php on line 28