Fatal error: Uncaught Error: Class "Symfony\Component\String\Tests\AbstractAsciiTestCase" not found in C:\xampp\htdocs\astra-backoffice\vendor\symfony\string\Tests\ByteStringTest.php:18 Stack trace: #0 {main} thrown in C:\xampp\htdocs\astra-backoffice\vendor\symfony\string\Tests\ByteStringTest.php on line 18