itween move to do not end(even it is)

the bottom 2 function dont happen(debug.log show nothing) dont know why even the fireball already stop..any help is appreciated.

using UnityEngine; using System.Collections;

 public class fireball : MonoBehaviour {
 
     public GameObject fx01;
     
 
     void OnTriggerEnter(Collider other){
         if (other.tag == "body"){
             fx01.SetActive(true);
             iTween.MoveTo(fx01,iTween.Hash(
                                     "position",other.transform.position,
                                     "speed",50f,
                                     "oncomplete","onCompleteFromiTween",
                                     "easetype",iTween.EaseType.linear
                                     ));
             if(fx01.transform.position==other.transform.position){
                 fx01.SetActive(false);
                 fx01.transform.localPosition = new Vector3(0, 15f, 0);
                 Debug.Log("ConstantSpeedMove done");
             }
         }
     }
     
     
     void onCompleteFromiTween(){
         fx01.SetActive(false);
         fx01.transform.localPosition = new Vector3(0, 15f, 0);
         Debug.Log("ConstantSpeedMove done");
 
     }
 }