Question by ApolloVision · Mar 03, 2014 at 11:41 AM · javascript movement audio programming

ArgumentNullException: Argument cannot be null

I keep getting the error ArgumentNullException: Argument cannot be null. of my script. Its basically teling a gameObject (I named "Enemy") with a CharacterController to play sound whenever it moves horizontally and/or vertically.

 var footsteps : AudioClip;
 var CharacterController;
 
 
 
 function Start() 
 {
    audio.clip = footsteps;
     audio.loop = true;
 }
 
 
 
 
 function Update()
 
 {
 
 
 
 
    if (CharacterController("Horizontal") != 0 || CharacterController("Vertical") != 0)
 
 
     {
 
 
 
 
 
       if(!audio.isPlaying)
 
           audio.Play();
 
 
    }
 
    
 
    else if(CharacterController("Horizontal") == 0 && CharacterController("Vertical") == 0)
 
 
        audio.Stop();
 
 
 }

What's more wierd is despite of the error I could still play the game just fine but it is annoying that whenever I look at my console box for debugging this same error display every frame.

EDIT: For more detail: I am trying to play a footstep audio clip whenever the gameObject (the Enemy) moves. It works but this error always show up in my console box.

Add comment · Show 5

perchik · Mar 03, 2014 at 07:25 PM 0

You have a variable named CharacterController which is also a type, and is probably not a good idea.

Dblfstr · Mar 03, 2014 at 07:52 PM 0

What line is giving the error? Do you have an audiosource attached to your gameObject? Is this going to be the only audio that is played by this gameobject?

ApolloVision · Mar 04, 2014 at 05:12 AM 0

It is line 24 I believe. I only have one audio clip at the moment. it is just a few seconds of footstep sounds looped.

This works with my Player, so when I move horizontally or vertically it plays the adui, but not with the Enemy AI.

ApolloVision · Mar 04, 2014 at 05:21 AM 0

It is line 24 I believe. I only have one audio clip at the moment. it is just a few seconds of footstep sounds looped.

This works with my Player, so when I move horizontally or vertically it plays the audio, but not with the Enemy AI.

I'm basically trying to tell the object that whenever it moves horizontally or vertically, play the audio.

Benproductions1 · Mar 04, 2014 at 10:25 AM 1

Your variable CharacterController has no type and is therefore of type: Object by default.
There is a name conflict between your variable CharacterController and the UnityEngine type: CharacterController
You are calling your variable. Unless your variable is a (non-behaviour) type or a function you should (and cannot) call it.

How to fix it: