I also had this problem when upgrading to 2.5, but by accessing the themes.php file directly, I was able to revert from K2 RC 3 to the standard theme.
That solved the problem for now. I am going to try the new RC4 of K2 to see if that helps.
Edit:
After the install of RC4 my style was broken, but the error was gone. After configuring a bit, the error appeared again. I discovered that this error is caused by activating the K2 “Sidebar Manager”.
So my guess is that it is sufficent to disable the manager, to get the admin-panel to work correctly.
Thread Starter
memorx
(@memorx)
I got this after looking long and hard. There was a fix for this, more than one actually. However, when I updated WordPress, the problem came back, and I forgot to take a backup of the old files.
Now I can’t find the solutons I found last time. Anyone know of posts with a such solution?
