1. Unplug and replug your throttle making sure to line up the arrows and pins to ensure proper connection when. Make sure the throttle pins aren't bent.
2. If Step 1 does not solve the error, unplug and replug all of the connections on your kit Main Wiring Harness (display, throttle, brake levers) including the Main Wiring Harness connection with the motor lead and battery connections. Make sure no pins are damaged on the Main Wiring Harness and line up the arrows and pins when reconnecting everything to ensure proper connection.
3. If Step 2 does not solve the error, unplug just the throttle from your bike. Does the error go away? You may need a new throttle.