Drag and Drop causes oblject to disapear

when I implement this and try to move the object, it disappears off screen`using System; using System.Collections; using System.Collections.Generic; using UnityEngine; using UnityEngine.EventSystems;

%|-560203107_1|% using System.Collections; using System.Collections.Generic; %|1223982083_4|% %|-1558486400_5|%

%|-1546095882_7|% { public void OnBeginDrag(PointerEventData eventData) { Debug.Log("On BEGIN DRAG"); } public void OnDrag (PointerEventData eventData) { Debug.Log("On DRAG"); this.transform.position = eventData.position; } public void OnEndDrag(PointerEventData eventData) { Debug.Log("On END DRAG"); }

%|-219871724_23|% %|-1326688760_24|% }

` this is code from a script in a project back when I had it working in unity 5.2

 using UnityEngine;
 using System.Collections;
 using UnityEngine.EventSystems;
 
 public class DragnDrop : MonoBehaviour, IDragHandler, IBeginDragHandler, IEndDragHandler {
 
     public GameObject discard;
     public GameObject attackPanel;
 
     // Use this for initialization
     void Start () {
 
 
     
     }
     
     // Update is called once per frame
     void Update () {
     
     }
     //Drag and Drop functionality//
     //--------------------------//
     //---------------------------//
     
     public Transform parentToReturnTo = null;
     
     public void OnBeginDrag(PointerEventData eventData)
     {
         //Debug.Log ("BeginDrag");
         parentToReturnTo = this.transform.parent;
         this.transform.SetParent (this.transform.parent.parent);
         
         GetComponent<CanvasGroup> ().blocksRaycasts = false;
 
         discard.SetActive (true);
         attackPanel.SetActive (true);
 
     }
     
     public void OnDrag(PointerEventData eventData)
     {
         //Debug.Log ("Drag");
         this.transform.position = eventData.position;
     }
     
     public void OnEndDrag(PointerEventData eventData)
     {
         //Debug.Log ("EndDrag");
         this.transform.SetParent (parentToReturnTo);
         
         GetComponent<CanvasGroup> ().blocksRaycasts = true;
 
         discard.SetActive (false);
         attackPanel.SetActive (false);
     }
 }