RTS Scripting - Need help

Hey,
I've been working on a small RTS project as my first game and I've gotten stuck on this bug for a while and not sure how to get around it since I'm new to the language and don't have too much experience.
Would be great if someone could point out the issue and tell me what I should do.

Currently, I'm trying to make a unit move to the position of my mouse for all units that are selected and am receiving an error saying NullReferenceException: Object reference not set to an instance of an object.

Here are my relevant scripts:

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class Actions : MonoBehaviour
6. {
7.     //private Vector3 target;
8.     //public float speed = 20f;
9.     //public Vector3 startMarker; //Start position of journey
10.     //public Vector3 endMarker; //End position of journey
11.     //private Vector3 pos; //Position of mouse
12.     //private float startTime;
13.     //private float journeyLength;
14.     public LayerMask hitLayers;
15.     UnitManager unitManager;
16.  
17.     void Update()
18.     {
19.         Vector3 mouse = Input.mousePosition;
20.         Ray castPoint = Camera.main.ScreenPointToRay(mouse);
21.         RaycastHit hit;
22.         if (Physics.Raycast(castPoint, out hit))
23.         {
24.             if (Input.GetMouseButtonDown(1))
25.                 unitManager = GetComponent<UnitManager>();
26.                 for (int i = 0; i < unitManager.selectedUnits.Count; i++)
27.                 {
28.                     unitManager.selectedUnits[i].transform.position = hit.point;
29.                     print("moved");
30.                 }
31.         }
32.     }
33. }

Script I'm trying to access the list from:

Code (CSharp):

1. using System;
2. using System.Collections;
3. using System.Collections.Generic;
4. using UnityEngine;
5.  
6. public class UnitManager : MonoBehaviour
7. {
8.     RaycastHit hit;
9.     public List<Transform> selectedUnits = new List<Transform>();
10.     bool isDragging = false;
11.     Vector3 mousePosition;
12.     private bool isMultiSelect;
13.  
14.     private void OnGUI()
15.     {
16.         if (isDragging)
17.         {
18.             var rect = ScreenHelper.GetScreenRect(mousePosition, Input.mousePosition);
19.             ScreenHelper.DrawScreenRect(rect, new Color(0.8f, 0.8f, 0.95f, 0.1f));
20.             ScreenHelper.DrawScreenRectBorder(rect, 1, Color.blue);
21.         }
22.  
23.     }
24.  
25.  
26.  
27.     // Update is called once per frame
28.     void Update()
29.     {
30.         //Detect if mouse is down
31.         if (Input.GetMouseButtonDown(0))
32.         {
33.             mousePosition = Input.mousePosition;
34.             //Create a ray from the camera to our space
35.             Ray camRay = Camera.main.ScreenPointToRay(Input.mousePosition);
36.             //Shoot that ray and get the hit data
37.             if (Physics.Raycast(camRay, out hit))
38.             {
39.                 //Do something with the data
40.                 if (hit.transform.CompareTag("PlayerUnit"))
41.                 {
42.                     SelectUnit(hit.transform, Input.GetKey(KeyCode.LeftShift));
43.                     Debug.Log(hit.transform);
44.                 }
45.                 else if (hit.transform.CompareTag("Ground"))
46.                 {
47.                     DeselectUnits();
48.                 }
49.             }
50.         }
51.  
52.     }
53.  
54.     private void SelectUnit(Transform unit, bool isMultiSelect)
55.     {
56.         if(!isMultiSelect)
57.             {
58.                 DeselectUnits();
59.             }
60.         selectedUnits.Add(unit);
61.         unit.Find("Highlight").gameObject.SetActive(true);
62.     }
63.  
64.     private void DeselectUnits()
65.     {
66.         for(int i = 0; i < selectedUnits.Count; i++)
67.         {
68.             selectedUnits[i].Find("Highlight").gameObject.SetActive(false);
69.         }
70.         selectedUnits.Clear();
71.     }
72. }
73.  

 

What's the exact line where the error occurs?

A Null Reference Exception basically means you put a dot (.) after the name of some variable that doesn't currently have a value assigned to it.

For example, this might happen if you tried to GetComponent<Something> and then do something with that component, but it turned out that your object didn't have any Something attached to it.

 

The error appears on line 26 of the Actions script

The error appears on line 26 of the Actions script

 

Then either unitManager is null (meaning there is no UnitManager component attached to the same object as your Actions component) or unitManager.selectedUnits is null (I don't immediately see a way this would happen, so my money is on the first thing).

If you're not sure which, you can try adding Debug.Log statements to test them each one at a time.

 

Hello , i need to help of my first RTS I have this error... Does it tje solution of this error?
Assets \ Scenes \ Script camera \ InputManager.cs (12,1): erreur CS1519: jeton non valide '{' dans la déclaration de membre de classe, de structure ou d'interface