Gmax Error

I got the (from what i've heard) typical gmax error about not finding makemdl.exe
i've fixed the meters thing so it's not that, so i give you an lovely presnt (drom roll) an error report (don't you love me:-*)
Running model
Start! (C:\Program Files\Microsoft Games\Flight Simulator 9\Aircraft\bttfII\Model\bttfII)
Loading X C:\Program Files\Microsoft Games\Flight Simulator 9\Aircraft\bttfII\Model\bttfII...
ERROR: Invalid X file: C:\Program Files\Microsoft Games\Flight Simulator 9\Aircraft\bttfII\Model\bttfII.
Error!
Error!
oh and BTW the plane/car is the Back to the Future II flying delorean

Running model
Start! (C:\Program Files\Microsoft Games\Flight Simulator 9\Aircraft\bttfII\Model\bttfII)
Loading X C:\Program Files\Microsoft Games\Flight Simulator 9\Aircraft\bttfII\Model\bttfII...
ERROR: Invalid X file: C:\Program Files\Microsoft Games\Flight Simulator 9\Aircraft\bttfII\Model\bttfII.
Error!
Error!
oh and BTW the plane/car is the Back to the Future II flying delorean