Hi,
I'm using Xcode 7.2.1. Since a while, I'm not able to upload my App any longer to the AppStore. Users are waiting for an update, but I cannot figure out what's wrong. The upload works but after a while I get a mail with the following content:
Invalid Signature - This error occurs when you have signed your app's installer incorrectly. There are two certs required for this process: the "3rd Party Mac Developer Application" cert and the "3rd Party Mac Developer Installer" cert. When signing your package, you need to ensure that you are using the Installer cert to sign your package. Ensure that you are specifying this cert when submitting your app via the Xcode Organizer or when running productbuild from the command line.
But when I specify the "3rd Party Mac Developer Installer" certification Xcode will not sign, it raises the following error:
3rd Party Mac Developer Installer: Joe Brown (JYZQ558PYA): this identity cannot be used for signing code
I checked my certificates in the keychain, they're all valid. The root certificates are valid as well.
I don't know what's going wrong here, any help is really, really appreciated!
Best regards,
Frank