Fatal error: Uncaught Error: Class 'Doctrine\Common\Lexer\AbstractLexer' not found in /var/www/app/appregwebservice/vendor/doctrine/annotations/lib/Doctrine/Common/Annotations/DocLexer.php:21 Stack trace: #0 {main} thrown in /var/www/app/appregwebservice/vendor/doctrine/annotations/lib/Doctrine/Common/Annotations/DocLexer.php on line 21