Fatal error: Uncaught Error: Class "Symfony\Component\CssSelector\Tests\Parser\Handler\AbstractHandlerTestCase" not found in C:\xampp\htdocs\astra-backoffice\vendor\symfony\css-selector\Tests\Parser\Handler\WhitespaceHandlerTest.php:17 Stack trace: #0 {main} thrown in C:\xampp\htdocs\astra-backoffice\vendor\symfony\css-selector\Tests\Parser\Handler\WhitespaceHandlerTest.php on line 17