When I try to export the project for ad-hoc distribution, I get the error message shown in the image. This project was developed by another member of my organization, in another macbook that I am currently using. This original macbook is no longer available for a developer profile.
Today I spent a lot of time working on Apple documentation and tried to (re) create certificates and revoke old ones, but without success. This iOS development / deployment element is new to me, so I'm very prickly in the dark at the moment.
I know that there are several new elements for deploying a beta application with Xcode 6; There are some good posts that are already popping up here, touching on some of these issues - but I'm completely dead end trying to use existing answers in my current issue. Any suggestions are welcome.

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