From our reports it seems that this usually happens on PS3 systems (Sony playstation), but may also happen on others. We also have one report here on the GeekDrop help forums of it happening after they used our Netflix Error AIP-701 hack.
Sometimes it also says:
I was recently getting this error (AIP-701) on the Netflix. app on my NSZ-GS7 GoogleTV box (GTV), whenever I would try to play any movie or TV show. It just happened out of nowhere. Turns out the solution is simple; the most annoying part of it is that you'll need to re-enter your Netflix password.