Need help with a scripting error.

I have this error when I was working with the stealth project cause I am new to unity.

NullReferenceException: Object reference not set to an instance of an object
LastPlayerSighting.Awake () (at Assets/Scripts/LastPlayerSighting.cs:23)


Here is my script it points at alarm = GameObject.FindGameObjectWithTag(Tags.alarm).GetComponent<AlarmLight>();

But hoping someone can help out.

Code (csharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class LastPlayerSighting : MonoBehaviour
5. {
6.     public Vector3 position = new Vector3(1000f, 1000f, 1000f);         // The last global sighting of the player.
7.     public Vector3 resetPosition = new Vector3(1000f, 1000f, 1000f);    // The default position if the player is not in sight.
8.     public float lightHighIntensity = 0.25f;                            // The directional light's intensity when the alarms are off.
9.     public float lightLowIntensity = 0f;                                // The directional light's intensity when the alarms are on.
10.     public float fadeSpeed = 7f;                                        // How fast the light fades between low and high intensity.
11.     public float musicFadeSpeed = 1f;                                   // The speed at which the
12.    
13.    
14.     private AlarmLight alarm;                                           // Reference to the AlarmLight script.
15.     private Light mainLight;                                            // Reference to the main light.
16.     private AudioSource panicAudio;                                     // Reference to the AudioSource of the panic msuic.
17.     private AudioSource[] sirens;                                       // Reference to the AudioSources of the megaphones.
18.    
19.    
20.     void Awake ()
21.     {
22.         // Setup the reference to the alarm light.
23.         alarm = GameObject.FindGameObjectWithTag(Tags.alarm).GetComponent<AlarmLight>();
24.        
25.         // Setup the reference to the main directional light in the scene.
26.         mainLight = GameObject.FindGameObjectWithTag(Tags.mainLight).light;
27.        
28.         // Setup the reference to the additonal audio source.
29.         panicAudio = transform.Find("secondaryMusic").audio;
30.        
31.         // Find an array of the siren gameobjects.
32.         GameObject[] sirenGameObjects = GameObject.FindGameObjectsWithTag(Tags.siren);
33.        
34.         // Set the sirens array to have the same number of elements as there are gameobjects.
35.         sirens = new AudioSource[sirenGameObjects.Length];
36.        
37.         // For all the sirens allocate the audio source of the gameobjects.
38.         for(int i = 0; i < sirens.Length; i++)
39.         {
40.             sirens[i] = sirenGameObjects[i].audio;
41.         }
42.     }
43.    
44.    
45.     void Update ()
46.     {
47.         // Switch the alarms and fade the music.
48.         SwitchAlarms();
49.         MusicFading();
50.     }
51.    
52.    
53.     void SwitchAlarms ()
54.     {
55.         // Set the alarm light to be on or off.
56.         alarm.alarmOn = position != resetPosition;
57.        
58.         // Create a new intensity.
59.         float newIntensity;
60.        
61.         // If the position is not the reset position...
62.         if(position != resetPosition)
63.             // ... then set the new intensity to low.
64.             newIntensity = lightLowIntensity;
65.         else
66.             // Otherwise set the new intensity to high.
67.             newIntensity = lightHighIntensity;
68.        
69.         // Fade the directional light's intensity in or out.
70.         mainLight.intensity = Mathf.Lerp(mainLight.intensity, newIntensity, fadeSpeed * Time.deltaTime);
71.        
72.         // For all of the sirens...
73.         for(int i = 0; i < sirens.Length; i++)
74.         {
75.             // ... if alarm is triggered and the audio isn't playing, then play the audio.
76.             if(position != resetPosition  !sirens[i].isPlaying)
77.                 sirens[i].Play();
78.             // Otherwise if the alarm isn't triggered, stop the audio.
79.             else if(position == resetPosition)
80.                 sirens[i].Stop();
81.         }
82.     }
83.    
84.    
85.     void MusicFading ()
86.     {
87.         // If the alarm is not being triggered...
88.         if(position != resetPosition)
89.         {
90.             // ... fade out the normal music...
91.             audio.volume = Mathf.Lerp(audio.volume, 0f, musicFadeSpeed * Time.deltaTime);
92.            
93.             // ... and fade in the panic music.
94.             panicAudio.volume = Mathf.Lerp(panicAudio.volume, 0.8f, musicFadeSpeed * Time.deltaTime);
95.         }
96.         else
97.         {
98.             // Otherwise fade in the normal music and fade out the panic music.
99.             audio.volume = Mathf.Lerp(audio.volume, 0.8f, musicFadeSpeed * Time.deltaTime);
100.             panicAudio.volume = Mathf.Lerp(panicAudio.volume, 0f, musicFadeSpeed * Time.deltaTime);
101.         }
102.     }
103. }

 

Anyone at all?

 

How do I use /code? Where do I put it I'm new to this.

 

My best guess would be there are no gameobjects with that tag, so FindGameObjectWithTag returns null.

Double check that Tags.alarm is what you think it is, and that the things you think are tagged with that are also what you think they are.


And you use code tags like this:
[ code ]
THIS IS WHERE THE CODE GOES
[ /code ]

only without the extra spaces.

Code (csharp):

1. THIS IS WHERE THE CODE GOES

 

Would I turn FindGameObjectWithTag and put null next to it? Cause everything seems to be in order.

 

http://forum.unity3d.com/threads/143875-Using-code-tags-properly

 

Thanks hope this is better now.

 

Everything seems to be in order I even followed the tutorial for this project a long with what the devs say and others did to and experienced the same thing. But everything seems okay. Anyone gotta explanation?

 

It just gives me more errors if I do that.

 

Oh wait hold on then.

 

It fixes that other error but gave me this one UnityException: Tag: alarm is not defined!
LastPlayerSighting.Awake () (at Assets/Scripts/LastPlayerSighting.cs:23)

This is what the new line looks like.

Code (csharp):

1. alarm = GameObject.FindGameObjectWithTag("alarm").GetComponent<AlarmLight>();

 

So how do I fix this?

 

I know how to switch tags but what do I switch out?

 

Have any ideas? Idk what to tag.

 

It always points at my gameController

 

The AlarmLight prefab should be tagged Alarm (looks like you are using alarm)

 

What do you mean? AlarmLight is a script and can't be tagged?

 

Thank you I just had to fix the other thanks so much all of you!

 

Could someone clarify exactly what you did in the inspector or this line of code to fix the Null Exception?

Code (csharp):

1.  
2.         alarm = GameObject.FindGameObjectWithTag(Tags.alarm).GetComponent<AlarmLight>();
3.  

 

In the inspector of the GameObject which has the AlarmLight component, dmb32693 changed the Tag to "Alarm"

 

So to put it simply. The person who did the tutorial has done it all wrong? Calling the References to the Tags Script fails. So it is actually better to just call the actual tags in the inspector. It has taken me two days to find this out. I had even copied the script from the website and replaced my own thinking there was something I missed in his fast talking.

 

It is too late for you, but it could help others...
You have to add Tag "AlarmLight" to the "light_alarm_directional". It helps me