Question by gaeloow · Nov 22, 2018 at 11:20 PM · error movement error message rts

RTS/MOBA movement script error,Error in RTS/moba movement script

Hi, I am having an error with a RTS/MOBA movement script. Here is the scipt:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.AI;
 
 public class Movement : MonoBehaviour {
 
     Camera cam;
 
     public LayerMask Ground;
 
     public NavMeshAgent playerAgent;
 
 
     
     void Awake () {
         cam = Camera.main;
     }
     
     
     void Update () {
         if (Input.GetMouseButtonDown(1))
         {
             playerAgent.SetDestination(GetPointUnderCursor());
         }
     }
 
     
     private Vector3 GetPointUnderCursor()
     {
         Vector2 screenPosition = Input.mousePosition;
         Vector3 mouseWorldPosition = cam.ScreenToWorldPoint(screenPosition);
         RaycastHit hitPosition;
         Physics.Raycast(mouseWorldPosition, cam.transform.forward, out hitPosition, 100000, Ground);
         return hitPosition.point;
     }
 }

there is the error:

NullReferenceException: Object reference not set to an instance of an object Movement.GetPointUnderCursor () (at Assets/Scripts/Movement.cs:32) Movement.Update () (at Assets/Scripts/Movement.cs:24)

Could someone help me?

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