Rhino.net command error

I am receiving this error when I execute the Ray Bombardment command. This occurs with only one model, so I feel confident that it is an issue in the model, not Rhino. Any suggestions would be helpful.

Thank you.

The plug-in seems to be dependent on an assembly called “Hare.dll”. This assembly was not found in the same directory as the plug-in file. I can’t think of a model-dependent reason why this would happen.