Compile Time Error - Corrupt XIB/NIB in XCode 4.1, iOS 4

Could anyone suggest what this error might be caused by and suggest any possible solution? This is a compile time error and doesn't开发者_StackOverflow中文版 seem to have anything to do with code as the file in question is a xib.

The series of events which seems to lead to this error was:

• Write project
• Save project to USB drive
• Open project at different location

This suggests to me that the problem is internal to XCode or there was corruption when copying to the USB but I haven't been able to verify either of those options. If anyone could shed some light on this, I'd be very grateful.

The solution was to re-create the nib as no attempt to rescue the current one or replace it with an old copy was successful.

If anyone has has the same problem and did find a way to solve it without re-creating the nib, I'd still like to know please!