While working in Interface Builder within Xcode (4.3.2), the application froze and I had to reopen it again.
Now I am getting this error when trying to open the nib file. What gives?

I have already starting a project from scratch when this happened yesterday as I thought maybe some project files got corrupted, but now it’s happened again on another project.
Any solutions?
Thanks
Console states that :
Apparently it is an Xcode problem, so I guess that is no answer at the moment to the problem :/
I think the only solution at the moment is to downgrade (Tried with Xcode 4.3.1 but still the same problem).
Can’t really see any other option.