can not export biped head bone pose

export other facial bone pose was success

when i export biped head bone pose,it say:
"Exported bone pose is identical to the Reference Pose and Contains no bones"

How would I best overcome this problem?
I'm using 3ds max 2010 64bit, and facefx plugin for udk2011-06.
thank!

That message means that all of the bones in the pose you are trying to export are in the same positions and orientations as those bones in the reference pose (e.g. the bone pose you're trying to export is exactly the same as the reference pose). Make sure you have keys on the bones and that they are different from the reference pose bones.