Fatal error: Uncaught Error: Interface "ProxyManager\Signature\SignatureCheckerInterface" not found in /var/www/apache/dev/cal/web/vendor/ocramius/proxy-manager/src/ProxyManager/Signature/SignatureChecker.php:17 Stack trace: #0 {main} thrown in /var/www/apache/dev/cal/web/vendor/ocramius/proxy-manager/src/ProxyManager/Signature/SignatureChecker.php on line 17