[Solved]Can not load CPU Skinning Sample

Recently I am learning MG through a classic sample program “CPU Skinning Sample” which is created by XNA.But I got a problem.
I have built this project and added dlls to MGCB, and it generated xnb successly.

I have searched many topics but can not find answer.
How to deal with it?
I am appreciated for any reply!

I have solved this by myself, so the forum manager can delete this topic now, thanks.