Fatal error: Uncaught Error: Interface "Illuminate\Contracts\Validation\ValidationRule" not found in C:\xampp\htdocs\gnu_7\g7\app\Rules\UniquePolicyPriorityPerTarget.php:20 Stack trace: #0 {main} thrown in C:\xampp\htdocs\gnu_7\g7\app\Rules\UniquePolicyPriorityPerTarget.php on line 20