That is a bit strange. I just gave it a try and everything works fine.
When does that error appear?
I thought that the code might be outdated, but that doesn´t seem to be the case (and actually nearly never should, as gamestudio should usually be completely backwards compatible). The only thing I could think of is, that there is some file missing for you, which exists on my system due to updating. But that should give you another error message then.