I tried that as well and its a no go.
I found this, however, looks like restoring is the only way around it at this point. http://ww.wp.xz.cn/support/topic/fatal-error-following-automatic-upgrade?replies=8
@lpstenu that didnt work for me.
any luck with this issue yet? i, and many others have the same problem.
same issue, i cant find anything to fix it, searched forums, my host is currently at a loss too.