Notice: Undefined variable: conn in D:\xampp\htdocs\E-learning\models\teacher\check_lesson.php on line 2

Notice: Undefined variable: course_no in D:\xampp\htdocs\E-learning\models\teacher\check_lesson.php on line 2

Fatal error: Uncaught Error: Call to a member function prepare() on null in D:\xampp\htdocs\E-learning\models\teacher\check_lesson.php:37 Stack trace: #0 D:\xampp\htdocs\E-learning\models\teacher\check_lesson.php(2): FetchSubCourse(NULL, NULL) #1 {main} thrown in D:\xampp\htdocs\E-learning\models\teacher\check_lesson.php on line 37