Maya 2015 Animation and Rigging Toolkit crashing when building control rig with no error?

Open the JointMover.mb scene inside Maya 2015 and re-save it.

…\Unreal Engine\4.7\Engine\Extras\Maya_AnimationRiggingTools\MayaTools\General\ART\ JointMover.mb

http://puu.sh/g6aoq/9b39280372.png