i am using the new xcode 4.5, i have this lines of code on some view controller:
DiscoverCell* cell=[table dequeueReusableCellWithIdentifier:@\"DiscoverCell\
The name after "loadNibNamed:" must be the name of the nib file (in project navigator on the left side of the screen), sometimes people write there 'cell identifier' that writes from the start in CellForRowAtIndexPath (static NSString ...).
May be your problem in this little fault?
After disabling Auto-Layout for all my .xib files I still had the error. This was due to the fact I used Text -> Attributed for a UILabel in a .xib file.
After setting it to Plain the error was gone.