Yep - happened to me too. After I had taken off the sprocket cover , but it took 3 weeks before the fault appeared. I had just nicked the neutral lead going down to the switch.
Cover off , found offending fault- and repaired with a generous helping of insulating tape. Problem is as the wire is black and at the back of the sprocket cover , you can't really see it until you take off the cover.
Fault also allows you to select gear and drive off with the side stand down.
I will eat my hat if this ain't the problem