Note: if there are any splices or if you extended your control arm cables, remove the added wire and test.
First turn off the system, disconnect and reconnect the 2nd operator wires. Test the system by turning back on.
If the error went away, it was connection issue. If notcontinue to Step 2
Turn the system to the off position and remove the wires connected to the 2nd operator terminal. With the wires disconnected turn the system back on.
The control board may be the issue, please contact technical support.
The 2nd operator control arm likely defective.
Go ahead and run the 2nd operator arm to ensure proper operation. This assuming that the gate is able to move without physically being restricted by the 1st .