**Original Post By Gweth**
Ok I used to have this problem once myself...yet I never figured out the fix, yet somehow fixed it, lol.
Many skins/models the authors of the said file often thought "Yeah people will love my file so i'll add custom animations and new weapons etc into it, screwing their game slightly."
The new trasnformers models do this.
The new Ninja Turtles Models do this.
Many others do this.
Naboohills 2.1 does not, as those vehicles in that map...didn't come with the map, lol. They are from the base game, those vehicles such as x-wing and lambda class shuttle are in the game the second you click 'yes I want to tinstall Jedi Academy.'
So it is a conflict with some of the custom files you have installed.
Myself, I have all of those maps installed, plus over 200 skin and model files - error free
My suggestion would be, remove all skin/model files from yuor base folder, and place them in you japlus folder. the base folder isn't the most reliable.