WHEN I IMPORT ANIMATION FROM MAYA 16 it give this error and mesh become complex?

Warning The following bones are missing from the bind pose: LLeg1_jnt4 LLeg2_jnt4 LLeg3_jnt4 RLeg1_jnt4 RLeg2_jnt4 RLeg3_jnt4 This can happen for bones that are not vert weighted. If they are not in the correct orientation after importing, please set the “Use T0 as ref pose” option or add them to the bind pose and reimport the skeletal mesh.