thuan: I copied your whole script exactly and tested it -> it goes on my system!
Are you sure, there isn't nothing else, which could make the error??
Because - my tip would be:
Make a new level, with only this code... If than the error message also appears it have to be a bug ?!

ventilator: I copied your car code (the VECTOR-"Bug" have I edit! -- so it doesn't explodes anymore ) and have the problem, that the wheels centers its selve (=drehen sich um sich selber...!? ). The aftereffect is, that the car jumps around the room .
...Do you have an idea what's the reason??

Thx,
Clemens

P.S. Man-man... Was ich da für ein Müll unten geschrieben habe . Aber naja, sieh's positiv: Evtl. hätte Marco sonst dein Problem übersehen. Außerdem konnte ich ihm somit mit dem Bilder-Lob eine Freude machen !!!