'EventType' does not contain definition for "MouseUp"

i just installed the UFPS AI Addon and i have this error:

CS0117: 'EventType'does not contain definition for "MouseUp" and it happens in a script called TargetMover.cs at line 23 as this is the code: using UnityEngine; using System.Collections;

 public class TargetMover : MonoBehaviour {
     
     /** Mask for the raycast placement */
     public LayerMask mask;
     
     public Transform target;
     
     /** Determines if the target position should be updated every frame or only on double-click */
     public bool onlyOnDoubleClick;
     
     Camera cam;
     
     public void Start () {
         //Cache the Main Camera
         cam = Camera.main;
     }
     
     public void OnGUI () {
         
         if (onlyOnDoubleClick && cam != null && Event.current.type == EventType.MouseUp && Event.current.clickCount == 2) {
             UpdateTargetPosition ();
         }
     }
     
     // Update is called once per frame
     void Update () {
         
         if (!onlyOnDoubleClick && cam != null) {
             UpdateTargetPosition ();
         }
         
     }
     
     public void UpdateTargetPosition () {
         //Fire a ray through the scene at the mouse position and place the target where it hits
         RaycastHit hit;
         if (Physics.Raycast    (cam.ScreenPointToRay (Input.mousePosition), out hit, Mathf.Infinity, mask)) {
             target.position = hit.point;
         }
     }
     
 }