It might be a virus, but I seriously doubt it, it could just be a glitch with the South Pole I get a lot of glitches there. I'd try getting back on and trying to go back to your home before the Error message pops up. If the Error Message still shows up in a different land, then you know it's not just the South Pole, and you might need to re-install FeralHeart or something like that. I could be wrong, so don't re-install unless someone else confirms it.