Fatal error: Uncaught Error: Class "Doctrine\Common\Collections\ArrayCollection" not found in /var/www/html/test/steintiger/system/src/Grav/Framework/Collection/ArrayCollection.php:19 Stack trace: #0 {main} thrown in /var/www/html/test/steintiger/system/src/Grav/Framework/Collection/ArrayCollection.php on line 19