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: 
I got same issue. I was pretty sure about my provisioning and certificate etc are properly set. I created all these at apple dev portal while my **Xcode 6.2** was opened. After downloading certificate and provisioning, I double clicked both and then was able to choose for signing from Xcode. That is **NO Xcode restart needed up-to this point** as new provisioning file is available to be chosen from Xcode. Then I archived the binary and it opened in Organizer for submission. 

But here comes the actual issue that **Organiser** is not aware about my true assets. So, here we need to **restart** the Organiser (Xcode). I must say a bug at Apple's end to not make Organiser aware about the updated assets. As after restarting the Organiser, I submitted the app and it **prompted to allow to sign certificate from Keychain**.
Don't listen to anyone.

DO NEXT:

1. Open XCODE
2. Go to Xcode > Preferences > View Details
3. You will see Signing Identifies at the top of new opened window. There will be "iOS Development" or "iOS Distribution". (in my case there was only 1 - iOS Development)
4. Revoke all Signing Identifies you have there
5. Click "+" button and click "iOS Development" then "iOS Distribution". Now you are requesting new identifies!

FINISH! ONLY 5 STEPS