2021 GasGas MC-E5 Error 42.

My son has a 21 GasGas MC-E5. Rode it during practice no issues. First moto cuts off on him after the gate, powered on and same thing. Moto 2 powered on bike foot on the brake twisted throttle forward made it 3/4 way around the track after jump and bike cut off. Error coming up with 42. posted this on Facebook ebike forum and someone mentioned Free Wheel Sensor. Looked online and called dealer no luck. Any help would be appreciated to get him back up and running for his eclass.