Fatal error: Uncaught Error: Interface "Whoops\Handler\HandlerInterface" not found in C:\Servers\htdocs\inventory.fitzalan.co.uk\vendor\filp\whoops\src\Whoops\Handler\Handler.php:15 Stack trace: #0 {main} thrown in C:\Servers\htdocs\inventory.fitzalan.co.uk\vendor\filp\whoops\src\Whoops\Handler\Handler.php on line 15