Distribution certificate / private key not installed

Question

Using Xcode 9.1, after building an iOS app, I want to archive it and upload it to the appStore for beta-testing. But I get the following issue after clicking the button

Answer 1

EDIT: I thought that the other computer is dead so I'm fixing my answer:

You should export the certificate from the first computer with it's private key and import it in the new computer.

I prefer the iCloud way, backup to iCloud and get it in the new computer.

If you can't do it with some reason, you can revoke the certificate in Apple developers site, then let Xcode to create a new one for you, it'll also create a fresh new private key and store it in your Keychain, just be sure to back it up in your preferred way