Fatal error: Uncaught Error: Class "Symfony\Component\String\AbstractUnicodeString" not found in C:\Xampp\www\0050467\ims-mobile\vendor_\symfony\string\UnicodeString.php:33 Stack trace: #0 {main} thrown in C:\Xampp\www\0050467\ims-mobile\vendor_\symfony\string\UnicodeString.php on line 33