Fatal error: Uncaught Error: Class "Doctrine\Common\Lexer\AbstractLexer" not found in /var/www/usonboard.com/vendor/doctrine/lexer/tests/MutableLexer.php:10 Stack trace: #0 {main} thrown in /var/www/usonboard.com/vendor/doctrine/lexer/tests/MutableLexer.php on line 10