How Can I Retarget From Motion Capture To Fbik?

[3dxiner]

hi everyone

I've used FBIK in my character skeleton and now i want to retarget from Motion captured Skeleton to the main Character.

but there is a problem: after selecting source and target skeletons and hit retarget, an error message appears:

"Must select a source and target joint hierarchy "

In maya torubleshooting there is a solution that dosn't work :

((Duplicate your character’s skeleton without the keys.
Create the full body IK effectors for the duplicate skeleton.
See Prepare your character for full body IK, Label or rename your character’s joints, and Create the full body IK system for your character.

Turn on the display of the FBIK FK skeleton.
Select Skeleton > Full Body IK > Show FBIK FK Skeleton.

Retarget the animation from the original skeleton to the duplicate’s FBIK FK skeleton)

PLEASE! tell me how can i retarget on FBIK skeleton or add FBIK to key framed skeleton nor....