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:

![enter image description here](https://i.stack.imgur.com/XJOZQ.png)

Can anybody tell me how to solve this?

Answer: 
Only this way solved the issue for me:
Open the "Keychain Access" app and select "View" -> "Show Expired Certificates". Remove ALL expired Apple certificates! 
Restart Xcode.

See: Xcode unable to create distribution builds for App Store submissions or Enterprise apps -> <https://developer.apple.com/support/certificates/expiration/>
Had same problem and now i can EXPORT my App again. 
1) this reply was very funny but good NOT TO HEAR ANYONE combining with 
2) answered Sep 19 '14 at 23:21 
hepled me to get work on my iPhone. 

Go to development.apple.com -> Certificates -> All / Production and just delete you **iOS Distribution** thing. It could be so that you deleted all certificates local and it does not match the original anymore thats why you have this message with this image =) As i said i had the same problem. After deleting just Archive and Export new and it will do this for you automaticly. 

**Version 6.1.1 (6A2008a)**