Failed to locate or generate matching singing assets Xcode 7.2.1

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.

have u checked in keychain that your certificates are valid or not? — Uma Madhavi, Feb 15 '16 at 08:54
check this one.It may be helpful http://stackoverflow.com/a/35403096/5362916 — Uma Madhavi, Feb 15 '16 at 08:57

score 12 · Accepted Answer · edited May 23 '17 at 12:30

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.

Thank you! I had added the new certificate but it mysteriously failed until the expired certificate was deleted. — Onyxite, Feb 24 '16 at 14:50

Failed to locate or generate matching singing assets Xcode 7.2.1

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