IK Elbow not working?

I’m trying to make character elbow movable like the hand. In my case, is not moving at all. Is it from my script or something else ?

public GameObject rightHandObj, leftHandObj,rightElbowObj,leftElbowObj; public Transform IK_point; private Animator mAnimator;   private void Start()  {     mAnimator = this.GetComponent<Animator>(); }  private void OnAnimatorIK()  {       if (mAnimator)     {          mAnimator.SetLookAtWeight(1.0f, 0.5f);         mAnimator.SetLookAtPosition(IK_point.position);          if (ikActive)         {             if (rightHandObj != null)             {                 mAnimator.SetIKPositionWeight(AvatarIKGoal.RightHand, 1);                 mAnimator.SetIKRotationWeight(AvatarIKGoal.RightHand, 1);                 mAnimator.SetIKHintPositionWeight(AvatarIKHint.RightElbow, 1);                  mAnimator.SetIKPosition(AvatarIKGoal.RightHand, rightHandObj.transform.position);                 mAnimator.SetIKRotation(AvatarIKGoal.RightHand, rightHandObj.transform.rotation);                 mAnimator.SetIKHintPosition(AvatarIKHint.RightElbow, rightElbowObj.transform.position);               }              if (leftHandObj != null)             {                 mAnimator.SetIKPositionWeight(AvatarIKGoal.LeftHand, 1);                 mAnimator.SetIKRotationWeight(AvatarIKGoal.LeftHand, 1);                 mAnimator.SetIKHintPositionWeight(AvatarIKHint.LeftElbow, 1);                  mAnimator.SetIKPosition(AvatarIKGoal.LeftHand, leftHandObj.transform.position);                 mAnimator.SetIKRotation(AvatarIKGoal.LeftHand, leftHandObj.transform.rotation);                 mAnimator.SetIKHintPosition(AvatarIKHint.LeftElbow, leftElbowObj.transform.position);              }         }     } 

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