Wiper Protection Error
The error that you are getting is a machine protection error. The printer stops because it is not sensing the wipers where it thinks that they are supposed to be.
Could be that the belt on the wiper motor is damaged or loose, perhaps the sensor itself is damaged or the wires are loose.
If this happens, just open the side cover, and manually "push" the wipers into it's little "home" behind the wiper scraper. Then turn the machine back on.
If the problem continues, call your dealer/technician. Unless you have an older VP, you are probably covered under warranty.
Hope this helps!
~E