Xcode error whenever I try to use Refactor

Question

When I try and refactor, I get the following internal error message:

File: /SourceCache/DevToolsIDE/DevToolsIDE-1708/pbxinterface/Snapshots/XCDirectorySnapshotSyncOperation.m Line: 137 Object: <XCDirectorySnapshotSyncOperation:0x201d51560> Method: _setErrorMessage: Assertion failed: nil == _errorMessage 

I have tried everything. I reinstalled the new version of Xcode, I tried reinstalling the old version of Xcode, nothing works?

Answer 1

Try deleting the cache file indicated in the error and try again.
The cache file may have become corrupt and caused a crash.
Also report it to Apple at http://bugreport.apple.com

Answer 2

It was as simple as returning my target to 5.1 (I tried to execute 3 for maximum backward compatibility) ... I assume that before deployment I can return it to target 3, but leaving it 5.1, while refactoring is definitely I helped