Unable to create Animation State in Animator Window from selected Animation Clip

Hi, I am trying to create animation state in animator window by selecting animation clip and The problem is State is created with the name of animation clip,but "motion" field of that animation state in inspector is showing none.I tried by drag and drop the animation clip into motion field but it is always NONE, I am using Unity 2018.2.0f2,Please help me how to solve t$$anonymous$$s issue