Why am I getting a registration error for CM 3215 Transport Lab? Published October 28, 2015 By Registration There are two parts to CM 3215 Transport Lab, a lecture (section 0A) and labs (sections L01, L02, etc.). If you do not enroll in both the lecture and lab sections then you will receive a link error. ← Previous Post What does a “Linked Course Required” error mean? Next Post → How can I prepare for registration?