When I try to export a project for ad-hoc distribution, I'm presented with the error message shown in the image. This project has been developed by another member of my organisation, on a different macbook to the one that I'm using at the moment. This original macbook is no longer available to obtain a developer profile from.
I've spent a good deal of time today working through Apple's documentation, and have tried (re)creating certificates, and revoking old ones - but with no success. This element of iOS development / roll out is new to me, so I'm very much stabbing in the dark at the moment.
I know there are some new elements to rolling an app out for Beta with Xcode 6; there are some good posts already floating around on here addressing some of those issues - but I'm utterly stumped trying to work existing answers in to my current problem. Any suggestions welcome.