Moving project to xcode 4 gives "Apple Mach-O Linker (Id) Error?

You have declared a global iVar with an assigned value (e.g. Int I = 2 ) with the same name in 2 different classes, one of those classes being StartChallengeViewController . If cleaning the project (Cmd Shift K) doesn't help, try renaming one of the iVars to something else, or not giving it an initial value.

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