Resolving the CodeSign error in Xcode when building new iPhone projects

Quick tip: if you’re just getting started with iPhone app development and trying to build and run an iPhone app project using the iPhone simulator in Xcode and you’re getting an error that looks like:

CodeSign error: Code Signing Identity ‘iPhone Developer’ does not match any code-signing certificate in your keychain. Once added to the keychain, touch a file or clean the project to continue.

The fix is pretty simple.  In the Build Results window (which you probably got to by clicking the error icon in the lower right corner of your project window), change the pulldown menu from ‘Device – iPhone xxx’ to ‘Simulator – iPhone xxx’.