Codesign error: Certificate identity appearing twice

Question

CodeSign error: Certificate identity \'iPhone Developer: XXXX (12345678)\' appears more than once in the keychain. The codesign tool requires there only be one.

So I

Answer 1

It's very easy, export the correct Certificate to your desktop. Delete that Certificate in the keychain. Try to build source with error message (have no cert..) Then import again the certificate. => Success!