Fatal error: Uncaught Error: Interface "Laravel\SerializableClosure\Contracts\Signer" not found in C:\Servers\htdocs\inventory.fitzalan.co.uk\vendor\laravel\serializable-closure\src\Signers\Hmac.php:7 Stack trace: #0 {main} thrown in C:\Servers\htdocs\inventory.fitzalan.co.uk\vendor\laravel\serializable-closure\src\Signers\Hmac.php on line 7