Fatal error: Uncaught Error: Class "Doctrine\Common\Lexer\AbstractLexer" not found in C:\Apache24\htdocs\cms_upgrade\vendor\doctrine\common\lib\Doctrine\Common\Lexer.php:23 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\cms_upgrade\vendor\doctrine\common\lib\Doctrine\Common\Lexer.php on line 23