How to rename the NIB file (or xib so it renames the nib)

This is the result of my run below. A few days ago, I renamed some of the objects (including the .xib file) and for some reason, XCode 4 found one I didn't rename? (I'm guessing because it says it can't load it). How do I find the names of the NIB, or change the xib file so it names the nib correctly?

GNU gdb 6.3.50-20050815 (Apple version gdb-1518) (Sat Feb 12 02:52:12 UTC 2011)
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This GDB was configured as "x86_64-apple-darwin".Attaching to process 27080.
2011-03-11 09:43:00.142 PointsEncodeDecode[27080:207] *** Terminating app due to uncaught except开发者_如何学JAVAion 'NSInternalInconsistencyException', reason: 'Could not load NIB in bundle: 'NSBundle </Users/rolfmarsh/Library/Application Support/iPhone Simulator/4.3/Applications/4066ECCF-3937-49B1-9FBE-1CE9BFA56844/PointsEncodeDecode.app> (loaded)' with name 'ReaderSampleViewController''

The missing Nib doesn't seem to be the main Nib file for the application the name of which is specified in the Info.plist file. Perhaps another Nib file has the old Nib name for creating an external object in it. I would first delete the entire build directory, and grep all text reference to the old filename in Terminal to find out who still has the reference to it.

grep -rnF '<old Nib name>' <path_to_your_project_directory>