Fatal error: Uncaught Error: Class 'Illuminate\Database\Eloquent\Relations\Pivot' not found in /home/edmedu/www/edmclass.com/admin.edmclass.com/app/Models/Board/TeacherMaterialCourse.php:9 Stack trace: #0 {main} thrown in /home/edmedu/www/edmclass.com/admin.edmclass.com/app/Models/Board/TeacherMaterialCourse.php on line 9