I've updated from 1.1.1 to 1.3.1. I know I was using an old version, but it worked stable and I didn't wan't to take any risks. But where I was afraid of, just happened. The core updated just fine, but while I was updating my plugins, it keeps giving an error when I try this at the Blogs plugin. I get an error in a yellow bar, but I there is no text. I added a picture of the error. I already tried to copy the core files again, but I get this message over and over again.