Fatal error: Uncaught Error: Interface "Illuminate\Contracts\Validation\Rule" not found in C:\xampp\htdocs\hannoole\schol\app\Rules\uniqueLessonInClass.php:10 Stack trace: #0 {main} thrown in C:\xampp\htdocs\hannoole\schol\app\Rules\uniqueLessonInClass.php on line 10