I have the same problem and cannot fix it. When I try new copies of the wordpress blog it works. Then I do something and it gets “damaged”.
I thought it was the (modified) theme (Cutline) but it was not. I thought it was the Stats plugin but it was not.
Maybe I spotted the problem: importing from my blog on wordpress.com gets the error.
What can I do?
I need to import the info from the blog.
Marco