Fatal error: Uncaught Error: Interface "Psr\EventDispatcher\StoppableEventInterface" not found in C:\Users\Administrator\Desktop\xamp\htdocs\sdk\league\event\src\StubStoppableEvent.php:9 Stack trace: #0 {main} thrown in C:\Users\Administrator\Desktop\xamp\htdocs\sdk\league\event\src\StubStoppableEvent.php on line 9