sid, i agree with Millietant about the stuck EXUP. I've had the same problem and fault code on the rev counter. i just tuck out the EXUP blade, gave it a good clean, re fitted and everything works fine.
After cleaning the EXUP a couple of times, i decided to take the EXUP blade out to see what differences this would make. there was no big dramas, the only issue was while cruising along at low revs and giving it a big handful, it didn't have the low down grunt and pulling power unlike when the blades in.
if you like to ride and change gear above 4000rpm why not take the blade out and you won't need to worry about the EXUP sticking again.