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EventSystems throws an error (Missing reference)

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Hi, I have a problem. I have Unity 5.1.1 and when I am trying to have "using UnityEngine.EventSystems" the reference is missing. I am trying to use it to get the object being dropped on ondrop function. I couldn't find a lot of info about this issue. Does anyone know how to fix that? Here is the code: using UnityEngine; using System.Collections; using UnityEngine.UI; using UnityEngine.EventSystems; public class Slot : MonoBehaviour { public int slotIndex; public Image icon; // Use this for initialization void Start () { icon=this.gameObject.GetComponent(); } // Update is called once per frame void Update () { if(Control.programSlots[slotIndex]==ProgramRunner.forLoop) { icon.color=Color.blue; } if(Control.programSlots[slotIndex]==ProgramRunner.moveBack) { icon.color=Color.red; } if(Control.programSlots[slotIndex]==ProgramRunner.moveForward) { icon.color=Color.yellow; } if(Control.programSlots[slotIndex]==ProgramRunner.moveLeft) { icon.color=Color.black; } if(Control.programSlots[slotIndex]==ProgramRunner.moveRight) { icon.color=Color.green; } if(Control.programSlots[slotIndex]==ProgramRunner.blankAction) { icon.color=Color.white; } } public void OnDrop(EventSystems.PointerEventData data) { Control.programSlots[slotIndex]=Control.selectedCard.action; Control.requestSlots[slotIndex]=Control.selectedCard.req; } } And here is the error: Assets/Slot.cs(41,28): error CS0246: The type or namespace name `EventSystems' could not be found. Are you missing a using directive or an assembly reference? Help Please!

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