xcodebuild (XCode 7.1) - unexpected successful exit code from cancelled command

Question

I'm getting the following during the bundle resources copying phase in xcodebuild (XCode 7.1):

2015-11-03 22:16:28.218 xcodebuild[28202:300463] DVTAssertions: Warning in /Library/Caches/com.apple.xbs/Sources/IDEXcode3ProjectSupport/IDEXcode3ProjectSupport-9061/Xcode3Core/LegacyProjects/Frameworks/DevToolsCore/DevToolsCore/BuildSystem/Runtime/PBXTargetBuildContext.mm:739 Details: unexpected successful exit code from cancelled command <C0505:'CpResource Foo.json':P10> Object: <PBXTargetBuildContext: 0x7faec015a440> Method:
-createCommandInvocationRecordFromInvocation: Thread: <NSThread: 0x7faebc8cc070>{number = 10, name = (null)} Please file a bug at http://bugreport.apple.com with this warning message and any useful information you can provide.

I have ~170 items I'm copying, but for some reason a few of them give me this error.

EDIT - I just ran the command again and now it works, so it doesn't seem deterministic.

Answer 1

The issue was a duplicate folder in the Copy Bundle Resources section. It used to be two different files, but they were moved so XCode decided to change them both to the folder they got moved into. Go figure.