Q:

Two view controllers have the same storyboard identifier

As the title suggests I am getting the error that two view controllers have the same identifier but the problem is, they don't! I have checked through all my storyboards multiple times and never saw any with the identifier! The full error is

Two view controllers have the same storyboard identifier "IAC".

Not only that, but there are no storyboards with the identifier "IAC". Its possible I may have named one that a long time ago but their certainly aren't any now. I also just updated Xcode to the ios 7.1 SDK and it's possible that's part of the error. Does anyone know why?

A:

In that case, press Command + Shift + F and then type the identifier that is being mentioned in the Warning / Error area.
Here after you search there will be list of matches, in that select Storyboard icons, and your answer lies there.

A:

remove derive data from Xcode -> Prefrences -> Locations -> DerivedData and rerun the project

