Fatal error: Uncaught Error: Class 'Doctrine\Common\Lexer\AbstractLexer' not found in /mnt/volume_lon1_01/backend/admin/vendor/doctrine/annotations/lib/Doctrine/Common/Annotations/DocLexer.php:33 Stack trace: #0 {main} thrown in /mnt/volume_lon1_01/backend/admin/vendor/doctrine/annotations/lib/Doctrine/Common/Annotations/DocLexer.php on line 33