I'm using guiminer and I keep getting some error when starting a worker, it does the same on both 7970's.

On the bottom of the program interface where it gives you current information it's giving me an error: "pit.deepbit.net:8332 29/03/2013 14:51:56, "No JSON object could be decoded" / IO errors -1, tolerance 2.

What does this mean, and how can I fix it?

Edit: I get the same error when trying to mine with my 3770k, so I'm guessing it's a setting that's messed up somewhere...just not sure what.