Fatal error: Uncaught Error: Class "Symfony\Component\String\AbstractUnicodeString" not found in C:\xampp\htdocs\slip\laravel-webhooks\vendor\symfony\string\UnicodeString.php:33 Stack trace: #0 {main} thrown in C:\xampp\htdocs\slip\laravel-webhooks\vendor\symfony\string\UnicodeString.php on line 33