This is a sample project that depicts a
objc: Class JKSerializer is implemented in both /Users/qnoid/Library/Application Support/iPhone Simulator/5.1/Applications/9CEF83D3-C9DE-4951-95DF-CC1A3DB223F8/TBUndefined.app/TBUndefined and /Users/qnoid/Library/Application Support/iPhone Simulator/5.1/Applications/9CEF83D3-C9DE-4951-95DF-CC1A3DB223F8/TBUndefined.app/TBUndefined. One of the two will be used. Which one is undefined.
behavior used as a reference for the How to debug a "Class JKSerializer is implemented in both" case post.