Cant import .obj files

I am trying to convert brushwork from Valve hammer editor into models using software called crafty. It turns brushes into .obj format which then could be imported into blender. However blender doesn’t want to import these .obj files and gives this error:

It only works if the brushwork I am trying to import is not very complex but if there are more than about 10 faces it fails.
Any help with this? Or maybe someone knows another way to import brushes into models using blender?

Try using the current version of blender
Supply an example .obj file that does not work

For future reference with someone having the same problem, I found converter named VMFtoSMD which works fine with blender if you have SMDtools addon installed.