I'm using the latest XCode (6.1) and I need to submit the app as soon as possible, but I can't seem to get around the "Your account already has a valid iOS distribution certificate" error.
I have the client's provisioning profile and I have his distribution certificate (which is valid) and his private key (I've checked using Keychain, it's definitely there). The bundle ID is also correct. I've deleted my provisioning profiles and certificates and reinstalled the client's many times now.
What could be causing this issue? I've seen a lot of topics here on SO with this problem, so I apologise beforehand for creating yet another clone, but I really don't know how to fix this.
edit: I'm running a brand new install of Yosemite by the way