Fatal error: Uncaught Error: Class 'Doctrine\Common\Lexer\AbstractLexer' not found in /var/www/html/vendor/doctrine/lexer/tests/Doctrine/Common/Lexer/ConcreteLexer.php:7 Stack trace: #0 {main} thrown in /var/www/html/vendor/doctrine/lexer/tests/Doctrine/Common/Lexer/ConcreteLexer.php on line 7