Fatal error: Uncaught Error: Class "Symfony\Component\Translation\Catalogue\AbstractOperation" not found in C:\Users\Administrator\Desktop\xamp\htdocs\sdk\symfony\translation\Catalogue\MergeOperation.php:25 Stack trace: #0 {main} thrown in C:\Users\Administrator\Desktop\xamp\htdocs\sdk\symfony\translation\Catalogue\MergeOperation.php on line 25