CoD UO mapping

Hi all, I have recently taken up CoD UO mapping as I'm part of a clan that still plays it. Please be gentle as I'm a complete novice but I've been playing about with Radiant and have managed to re-create some of the buildings in the game. I've even managed to compile a couple of them although that was no easy task to get it working. So my first problem is as follows. I obviously want to run round inside my newly created building and so I go to 'Start New Server' and I can't load anything let alone my new little map. The error message in every case is as per the picture. I've deleted loads of stuff out of the UO folder, but nothing is making the slightest difference. Ideas anybody?

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