I've had two error messages so far... One had something to do with CandyBar? I don't know, I was fighting Ossirian at the time... so I was in a raid and it would come up on certain occasions... I'm not sure what would trigger it though.
The other message I get is this: "Interface\AddOns\oSkin\core.lua:142: attempt to index local 'ddName' (a nil value)"
It only happens on the initial load and doesn't bother me after that...