killing my enemy causes problems:( please help:o

I think I have confused my game! I have created my map my 3rd person camera(smooth follow on my character) I have created a prefab from a 3d model called bone(my prefab is called bonetoss) just so that I can throw bones. By using tornadotwins script on shooting I attached my bonetoss prefab to shoot a rotating bone(the above prefab).
Anw the problem is when I shoot this bonetoss prefab to hit an enemy once that enemy is destroyed any other object I hit it gives me a null exception error-.-

So the scripts I have that are probably are of interest are enemy script character movement script and bonetoss script

Enemy script


var speed : float=5.0;
var lifeTime = 3.0;
var health = 100;
var domove : int = 0;


function Awake () //unity predifined function
{
//Destroy (gameObject, lifeTime);//delete fireballs in "lifetime"/time set can also be changed from unity

}
function applydamage(damage:int)
{
Debug.Log("in applydamage"+health);
health = health-damage;
if (health ==0)
{
Destroy(gameObject);
Debug.Log("newhealthis" +health);
}
}

function Update()
{
if (domove==1)
{
transform.Translate(Vector3(0,0,speed)*Time.deltaTime);
//Debug.Log("update");
animation.Play("soldier_run");
/*audio.clip = walk;
audio.Play("runbitch");*/
}
}

function move () {

domove =1;



//transform.Translate(Vector3(0,0,speed)*Time.deltaTime);
//animation.Play("soldier_run");

}
Ignore the domove stuff thats basically attached to another script when I hit a box the enemy moves (that works)

Bonetoss script:
#pragma strict

var lifeTime : int = 5.0;
var damage : int= 100;
var distance : float;
var maxdistance : float = 10;
var enemy :GameObject;

function Awake () //unity predifined function
{
Destroy (gameObject, lifeTime);//delete fireballs in "lifetime"/time set can also be changed from unity

}

function Start ()
{

enemy = GameObject.FindWithTag("enemy");

}

function OnTriggerEnter(other : Collider)
{
if( GameObject.FindWithTag("enemy"))
Debug.Log("you hit");
enemy.SendMessage("applydamage",damage);
}


and character controller script:


var rotationSpeed: float = 30;
var movementSpeed: float = 30;
var jumpingSpeed:float = 5;
var isGrounded:boolean = true;
var flashLight:Light;
var bullitPrefab:Transform;
var sprintSpeed =9;
var damage : int= 50;
var distance : float;
var maxdistance : float = 10;



var walk : AudioClip;



function Start ()
{

/*
flashLight = gameObject.Find("FlashLight").GetComponent(Light);*/
}



function Update ()

{

rigidbody.freezeRotation = true;



transform.Translate(0,0,Input.GetAxis("Vertical") * movementSpeed * Time.deltaTime);


transform.Rotate(0,Input.GetAxis("Horizontal") * rotationSpeed * Time.deltaTime,0);


if(Input.GetButtonDown("Jump") isGrounded)
{

rigidbody.velocity.y+=jumpingSpeed;
//animation.Play("zombie_jump");
}

/*if(Input.GetKeyDown(KeyCode.F))
{

if(flashLight.enabled)
{
flashLight.enabled=false;
}

else if(!flashLight.enabled)
{
flashLight.enabled=true;
}


}*/

if(Input.GetKey(KeyCode.LeftShift))
movementSpeed = sprintSpeed;
else
movementSpeed = 1;


if(Input.GetKey(KeyCode.V))
animation.Play("zombie_dance");


if(Input.GetKeyDown("w"))
{
audio.clip = walk;
audio.Play();
}
if(Input.GetKeyUp("w"))
{
audio.Stop();
}

if(Input.GetKeyDown("s"))
{
audio.clip = walk;
audio.Play();
}
if(Input.GetKeyUp("s"))
{
audio.Stop();
}



if(Input.GetButtonDown("Fire1")) //checks if pressed jump basically means spacebar

{
var bullit = Instantiate(bullitPrefab,transform.Find("spawnPoint").transform.position,Quaternion.identity);
bullit.rigidbody.AddForce(transform.forward *2000);


}

}





function OnCollisionStay(){
isGrounded=true;

}

function onCollisionExit(){
isGrounded=false;

}
I dunno if the last script is worth showing its how bonetoss is shot.
I have tagged my enemy models to "enemy"
I think my error is how I check for collision, by using debug.log it infact does show there is collision between the bone and the enemy. I feel like its the way I am asking unity to look for my enemies that is causing the problems :/
Any help is well appreciated though

My apologies for the extremely long post

 

null reference exception is the error I get* and it is pointing it out in bonetoss script at this line: enemy.SendMessage("applydamage",damage);

 

PLEASE put that in code tags.

 

which means the enemy is never got assigned. do a debug statement before sending the message to see whether the enemy is null or actually assigned.
this can happen if,
* the enemy does't have the tag attached (most likely)
* enemy isn't instantiated

 

it should be

Code (csharp):

1.  
2. function OnTriggerEnter(other : Collider)
3. {
4. if( other.CompareTag("enemy"))
5. Debug.Log("you hit");
6. other.transform.root.SendMessage("applydamage",damage); //to be safe
7. /*  or use other.SendMessageUpwards("applydamage",damage);*/
8. }
9.  
10.  

You are already getting a trigger event, so you take the other guys collider that's hitting the trigger.
Also, make sure you have a rigidbody on your gameObject, but set to Kinematic. Triggers don't work without them for some reason

 

I tried to use the script you said but I am getting a different error which makes no sense to me:S now it says "SendMessage applydamage has no receiver!" I used both ways even the commented out one but it gives me this when I shoot twice made sure it was correctly written (function name) also when you said make sure you have a rigidbody on your gameObject (I have 1 an all moving objects but which one were you refering to specifically cause I have not played around with "kinematic" etc)
Thank you for your response

PS it will work on the enemy as before so he will take 2 hits and die but now if I shoot anywhere else I get the error

 

I do apologize didn't notice them when I was creating this-.- cannot even find them now is it wrap

 

can you give me a hint on how to debug for what as I am not the best of programmers and heavily rely on examples:/

 

It's an exception message you get because anything else you hit that doesn't have the said function applied to it complains, you can set the receiver to

Code (csharp):

1.  
2.    other.transform.root.SendMessage("applydamage",damage,SendMessageOptions.DontRequireReceiver );
3.  
4.  

so it doesn't complain.

 

this worked flawlessly but I do not understand what was happening and what we just changed could you possibly explain to me like I am a kid from kinder-garden or something just in plain terms what was I doingthe way I see it is if I have a collision go to the other script see how much health is left(basically cause I called that function) if zero health destory that object (talking about one with an enemy tag am I correct till here?:

 

I think you're correct for the most part.

Also,

Code (csharp):

1.  
2. if (health ==0)
3. {
4. Destroy(gameObject);
5. Debug.Log("newhealthis" +health);
6. }

You cannot call the debug function after you destroyed the WHOLE object!!! lol

 

well sorry my bad debug stops when the function is destroyed I have noticed 1 more problem that is driving me crazy cause my enemy gets "destroyed". The scenario is if my character steps on a box the enemy gets called to move across the screen(if you noticed there was some domove stuff in enemy script). Problem is if I shoot the enemy and step on the object again I get : MissingReferenceException: The object of type 'GameObject' has been destroyed but you are still trying to access it. Is there a way for me to tell unity if the object is destroyed ignore this? again scripts involved is :

Enemy Trigger:

Code (csharp):

1.  
2. #pragma strict
3. var speed : float=5.0;
4. var enemy : GameObject;
5. var walk : AudioClip;
6.  
7. function Start()
8. {
9.     Debug.Log("start");
10.     enemy =  GameObject.FindWithTag("enemy");
11.     Debug.Log("enemy is" + enemy.tag); 
12.     //Debug.Log(GameObject.Find
13.     //enemy.SendMessage("move");
14. }
15.  
16. function OnTriggerEnter(other : Collider)
17. {
18.     if(enemy)
19.     Debug.Log("ouch");
20.    
21.     //enemy = GameObject.Find("swat");
22.     //Debug.Log("enemy is" + enemy.ToString);
23.  
24.     enemy.SendMessage("move",SendMessageOptions.DontRequireReceiver);
25.    
26.    
27.     audio.clip = walk;
28.     audio.Play();
29.     //GameObject.Find("swat").SendMessage("move");
30.  
31.     //Debug.Log(enemy.ToString);
32.     //enemy.
33.     //enemy.transform.Translate(Vector3(0,0,(speed*Time.deltaTime)));
34.    
35.  
36.         /*{
37.         enemy.transform.Translate(Vector3(0,0,(speed*Time.deltaTime)));
38.         //animation.Play("soldier_run");
39.     }*/
40. }
41.  

and enemy script :

Code (csharp):

1.  
2. #pragma strict
3.  
4. var speed : float=5.0;
5. var lifeTime = 3.0;
6. var health = 100;
7. var domove : int = 0;
8.  
9.  
10. function Awake () //unity predifined function
11. {
12. //Destroy (gameObject, lifeTime);//delete fireballs in "lifetime"/time set can also be changed from unity
13.  
14. }
15. function applydamage(damage:int)
16. {
17. Debug.Log("in applydamage"+health);
18.  health = health-damage;
19. if (health ==0)
20.     {
21.         Destroy(gameObject);
22.         Debug.Log("newhealthis" +health);
23.     }
24. }
25.  
26. function Update()
27. {
28.     if (domove==1)
29.     {
30.         transform.Translate(Vector3(0,0,speed)*Time.deltaTime);
31.         //Debug.Log("update");
32.         animation.Play("soldier_run");
33.         /*audio.clip = walk;
34.         audio.Play("runbitch");*/
35.     }
36. }
37.  
38. function move () {
39.  
40. domove =1;
41.  
42.  
43.  
44. //transform.Translate(Vector3(0,0,speed)*Time.deltaTime);
45. //animation.Play("soldier_run");
46.  
47. }
48.  
49.  
50.  
51.  

I tried to add an if statement if health >=1 domove=1 (which would activate my characters movement only if his health is greater than 1) but it doesn't matter he gets called to move even if his health is 0 giving me the error that I am calling an object that is not existent basically:O
and thank you again for all the help and attention