Fatal error: Uncaught Error: Class "PhpCsFixer\AbstractFixer" not found in I:\www\pvcRegex\vendor\friendsofphp\php-cs-fixer\src\Fixer\LanguageConstruct\IsNullFixer.php:28 Stack trace: #0 {main} thrown in I:\www\pvcRegex\vendor\friendsofphp\php-cs-fixer\src\Fixer\LanguageConstruct\IsNullFixer.php on line 28