Failed to locate or generate matching singing assets Xcode 7.2.1 [duplicate]

Question

I have just restarted my Mac and I'm having this error when trying to validate or upload to de Apple Store.

Failed to locate or generate matching signing assets:

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

Missing iOS Distribution signing identiti for xxxxxx Xcode can request one for you.

I have tried a lot of anwsers from Stackoverflow and nothing is working.

How can I tell Xcode to request it again?? I have gone to prefferencens and clicked "reset", "download all", I have deleted de account an logged again.

Any help will be appreciated.

Answer 1

Thanks to all.

The answer is here:

Missing iOS Distribution signing identity

As Evana said:

Check here: https://forums.developer.apple.com/thread/37208

Download https://developer.apple.com/certificationauthority/AppleWWDRCA.cer and double-click to install to Keychain. Select "View" -> "Show Expired Certificates" in Keychain app. Remove Apple Worldwide Developer Relations Certificate Authority certificates from "login" tab and "System" tab in Keychain app.

I did not dowloaded the certificate but in my machine there were 2 of the "Apple Worldwide Developer Relations Certificate" and one of them expired yesterday.

I hope this will be useful to someone.

If some administrator thinks the question must be deleted just ask me and I will delete it.

Again thanks to all.