Claw lift function

My 8th grade class has built the clawbot, and every team has experienced the same problem with the claw arm not lifting. Can you lead us to the solution for this?

Gdeluca,

Its possible that the arm motor is wired incorrectly, can you make sure its wired to port# 4?
Wiring diagram attached.

If this does not alleviates the problem, please contact [email protected]