joint problem maya to unity

I saw the kinematic example from there: http://kimkijeung.com/2011/02/10/unity-inverse-kinematics-solution/comment-page-1/#comment-289

and I tried to do for my own and I had the problem in the joints on hierarchy panel, there was an error about array I don't know why. Just I did if what I saw, alternatively I tried to do the joints in maya and after that I imported to unity and the same problem was occured. Is the problem because of the parent child relation, or must there not be the joints, there was and End game object int the level4 child, why that is located there, How can I solve this, please help :(