Yes, they are included by default in the template scripts. Furthermore, I have only added the Biped Player script (and thereby all the scripts necesarry for it to function that automatically comes along when adding) and the FPS AI script (and also the scripts automatically added for that one). And I haven't removed OR modified any of the scripts, and I am using templates all the way - not one single custom script.

I just think that it's very weird that, if I choose the Shooter_Project template when creating a new level, and following the exact same procedures and adding the exact same scripts, it works fine. But any other templates - with the same scripts added in the Project Manager - they give the error which I wrote in my first post.