Fatal error: Uncaught Error: Class 'Symfony\Component\CssSelector\Tests\Node\AbstractNodeTest' not found in /var/www/html/vendor/symfony/css-selector/Tests/Node/NegationNodeTest.php:18 Stack trace: #0 {main} thrown in /var/www/html/vendor/symfony/css-selector/Tests/Node/NegationNodeTest.php on line 18