ios - Why am I getting an error "Failed to locate or generate matching signing assets" in Xcode 6?

Question

I installed the Xcode 6 GM seed, and I'm trying to create an IPA file for the first time. After archive success, when I click on the Export button, a window appears saying:

Failed to locate or generate matching signing assets

Xcode attempted to locate or generate matching signing assets and failed to do so because of the following issues.

• Your account already has a valid iOS Distribution certificate.

  If you have your signing identity on another Mac, you can import a developer profile. You can also revoke the current certificate and request one again.

Here's a screenshot of the error:

Can anybody tell me how to solve this?

Answer 1

In keychain access, -> Show Expired Certificates, then in your login keychain click on expired certificate and delete it. I also had the same expired certificate in my System keychain, so I deleted it from there too.

-> After deleting the expired cert from the login and System keychains,download certificate from below link and open with keychain.

Download https://developer.apple.com/certificationauthority/AppleWWDRCA.cer and add it to Keychain access > certificates (which expires on 2023)

this solved my problem