Fatal error: Uncaught Error: Class 'Rector\Rector\AbstractRector' not found in /home/rrcwnqvo/public_html/vendor/kreait/firebase-php/utils/rector/src/Rector/InstanceofNegationParenthesesRector.php:18 Stack trace: #0 {main} thrown in /home/rrcwnqvo/public_html/vendor/kreait/firebase-php/utils/rector/src/Rector/InstanceofNegationParenthesesRector.php on line 18