Having some problems tweening can anyone help?

[Veggie1232]

Hey guys im animating this banner right now I'm going to have the van come from the far road and come up the closer hill..

I took the van made a movie-clip of it clicked into the movie clip added the rest of the layers to the van like the wheels. Then I made the wheels a movie clip went into those and animated them to rotate but when i go back to the main van movie clip to tween it to move left to right it just doesn't work? I can't explain why..

You can download my .fla file here: http://download156.mediafire.com/6qc84i6u7pag/sebfbqkezzemq82/Final+Banner+Flash.fla

if you can figure out whats wrong i moved the van animation to the front so u can find it easy.. I don't understand :S



Thanks!
-Ian