Hello everyone , I have problem to software when I was runnig program ARCS exe code or ARCS source code (it dosen't matter) I saw this error "Exception in thread Thread-1: Traceback (most recent call last): File "lib\threading.py", line 917, in _bootstrap_inner File "lib\threading.py", line 865, in run File "ARCS.py", line 5535, in monitorEnc File "ARCS.py", line 4531, in getRobotPosition NameError: name 'ser' is not defined" please guys I need to help thank you.