I have noticed that there are certain xmodels that just don't work. They give you this error when compiling:

This also occurs with some Blender models too. When I check the dialogue box thingy in radiant, it's something to do with their physics preset.

This is preventing me from adding certain models to my my map which i actually want to use. However, I can still compile with only physics presets not being able to be found. Does anyone know anything about these errors and why only certain xmodels get them? Is there a way to change the physics presets on the models to ones that the game can actually find?

Help would be greatly appreciated.

Thanks in advance.

-Ronan