Sorry to jump in here but I am having the same error and nothing I have done gets me away from the error. I ve went from V2 to V3 and back. I’m at a loss.
The only widgets I am using now in my side bars are text, recent comments, posts, ect… here is a link to what I am talking about.
http://www.yagervideo.com/tuningfork/101-2/
Underneath the embedded video you can see what I am talking about. Thanks for your help.