Fatal error: Uncaught Error: Interface "Psr\EventDispatcher\StoppableEventInterface" not found in C:\Servers\htdocs\inventory.fitzalan.co.uk\vendor\symfony\event-dispatcher-contracts\Event.php:31 Stack trace: #0 {main} thrown in C:\Servers\htdocs\inventory.fitzalan.co.uk\vendor\symfony\event-dispatcher-contracts\Event.php on line 31