you can't combine timeline animation with actionscript manipulation of the timeline tweened object.
to remedy use either all timeline animation or all actionscript animation.
Just this? I JUST CANT?!
Why, the animations is not tween is a motion animatio... the name of the movie clip is the same... Why cant combine???
For me this is a bug... Its dumb dont put this in flash, why make the program dont accept this type of combination????
And another IMPORTANT thing... i dont animate on timeline AND in AS.... I make the ANIMATION on TIMELINE, and i CHANGE on PROPERTY on the AS....
This is a bug, dont have any inteligent explanation to let the flash without this possibility (animate on timeline and change a property in as)...
there's an explaination but i'm not sure you're interested and the explaination won't solve any problem for you.
but you can register your complaint where someone from adobe may read it: