I thought that too, I've been serching for solution for two days)) and I actualy did!!! So the problem was in spring bones. You see, I've rewached their tutorials for the hundredth times and in the one of the tutorial called "EPS Import and Animater character setup" he says that you have to live one bone UNASSIGNED. But, on the other hand i've wached their video with the tree, he makes it move like it's windy and all tree bones was assigned and everything works anyway.