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First, I'd recommend getting the latest major release (1.11.0), or later. The fact that you have both some installation of Radiance and Daysim makes me think this is a version issue. OpenStudio's access to the included Radiance version was made a little more robust in versions 1.11.0 and greater. Failing that, there is likely a problem with the model itself; could you post the model (.osm) somewhere (e.g. Dropbox) so I can download it and take a look?