So I solved the last problem...it was not complicated after all...on the other hand I now have a new problem

I keep getting this message:
"Failed to load project file.
Please enter a valid project file."
I hit okay, I go to /applications/Tremulous20060704/base/scripts/default_project.proj
And then I get the same message. Advice? Is it just a problem with my default_project.proj file? Thanks!