I was getting this error 98.
I thing its something with the sockets of the controler.
I tighted the socket of the controller and everything is fine.
I got Error 98 when I first got my TC Max. It happened when I was stationary and went to pull away. I realised that I was holding the throttle very slightly open, which must have been putting some strain on the motor. I made a conscious effort the properly close the throttle at junctions after that and it hasn't happened since.