Fatal error: Uncaught Error: Interface "Doctrine\Persistence\Proxy" not found in D:\xampp\htdocs\ssw_doc\vendor\myclabs\deep-copy\fixtures\f013\B.php:7 Stack trace: #0 {main} thrown in D:\xampp\htdocs\ssw_doc\vendor\myclabs\deep-copy\fixtures\f013\B.php on line 7