Fatal error: Uncaught Error: Class "PhpParser\ParserAbstract" not found in C:\Apache24\htdocs\cms_upgrade\vendor\nikic\php-parser\lib\PhpParser\Parser\Php7.php:18 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\cms_upgrade\vendor\nikic\php-parser\lib\PhpParser\Parser\Php7.php on line 18