I ran across that error once (although it happened with both BlackSwan and Google Webapp). I thought it was a network problem, because it happened at the same time people were experiencing this:
viewtopic.php?f=3&t=116Have you tried powering the phone on/off, and switching to/from 3G-WiFi?
I also have an unbroken 32Gig 3GS. But it happened just once a couple of months ago. It's possible there are some localized AT&T network issues. Try airplane mode with just WiFi.