Help with cam mate/assembly

I am trying to make two paddles follow a path of a belt thatwraps around two pulleys, the paddles need to be a set distanceapart. i can get them to to move with no errors on the straightside of the belt, but when one rolls over the top/bottom pulley,they go into an error saying that the mate can not happen. attachedis the file i am working with. i can not get my assembly to attach,or i would post that up as well. i'm not sure how to go aboutgetting this to work, i would also like to have the paddles come ordelete when the belt length changes, not sure if this is possibleor not. if anyone can give me some feed back i would greatlyappreciate it. Thank you... KyleSolidworksAssemblies