Missing Method Exception and Null Reference Exception

Question

I was going through the tornadotwins tutorials on youtube, and for some reason their scripts keep giving me errors? I solved most of them but 2, a Missing Method Exception and Null Reference Exception.

The Missing Method Exception applied to my Turret control script, heres the script

 var LookAtTarget : Transform;
 var damp : float = 6.0;
 var bullitPrefab : Transform;
 var savedTime = 0;
 
 function Update ()
 {
      if(LookAtTarget)
      {
           var rotate = Quaternion.LookRotation(LookAtTarget.position - transform.position); 
           transform.rotation = Quaternion.Slerp(transform.rotation, rotate, Time.deltaTime * damp); 
           var seconds : int = Time.time;
           var oddeven = (seconds % 2);
           if(oddeven) 
               Shoot(seconds);
                 transform.LookAt(LookAtTarget);
      }
 
 }
 
 function Shoot(seconds)
 {
      if(seconds!=savedTime)
      {
           var bullit = Instantiate(bullitPrefab,transform.Find("TurretSpawnPoint").transform.position , Quaternion.identity);
           bullit.rigidbody.Addforce(transform.forward * 1000); 
      }
      savedTime=seconds;

}

And the error:

MissingMethodException: Method not found: 'UnityEngine.Rigidbody.Addforce'. Boo.Lang.Runtime.DynamicDispatching.MethodDispatcherFactory.ProduceExtensionDispatcher () Boo.Lang.Runtime.DynamicDispatching.MethodDispatcherFactory.Create () Boo.Lang.Runtime.RuntimeServices.DoCreateMethodDispatcher (System.Object target, System.Type targetType, System.String name, System.Object[] args) Boo.Lang.Runtime.RuntimeServices.CreateMethodDispatcher (System.Object target, System.String name, System.Object[] args) Boo.Lang.Runtime.RuntimeServices+c_AnonStorey12.m_6 > () > Boo.Lang.Runtime.DynamicDispatching.DispatcherCache.Get > (Boo.Lang.Runtime.DynamicDispatching.DispatcherKey > key, > Boo.Lang.Runtime.DynamicDispatching.DispatcherFactory > factory) > Boo.Lang.Runtime.RuntimeServices.Dispatch > (System.Object target, System.String > cacheKeyName, System.Type[] > cacheKeyTypes, System.Object[] args, > Boo.Lang.Runtime.DynamicDispatching.DispatcherFactory > factory) > Boo.Lang.Runtime.RuntimeServices.Dispatch > (System.Object target, System.String > cacheKeyName, System.Object[] args, > Boo.Lang.Runtime.DynamicDispatching.DispatcherFactory > factory) > Boo.Lang.Runtime.RuntimeServices.Invoke > (System.Object target, System.String > name, System.Object[] args) > UnityScript.Lang.UnityRuntimeServices.Invoke > (System.Object target, System.String > name, System.Object[] args, > System.Type scriptBaseType) > TurretControl.Shoot (System.Object > seconds) (at > Assets/Scripts/TurretControl.js:26) > TurretControl.Update () (at > Assets/Scripts/TurretControl.js:15)Assets/Scripts/TurretControl.js:15)

The next is a NullReferenceException for my MoveAround Script, heres the script, It took a while to get a solution for this. I dont know why the scripts arent working for me, they seem to work fine for most people...

 var speed = 3.0;
 var rotateSpeed = 3.0;
 
 function Update ()
 {
     var controller : CharacterController = GetComponent(CharacterController);
     var forward = transform.TransformDirection(Vector3.forward);  
     var curSpeed = speed * Input.GetAxis ("Vertical");
 
     controller.SimpleMove(forward * curSpeed);    
     transform.Rotate(0, Input.GetAxis ("Horizontal") * rotateSpeed, 0);    
 
     if(Input.GetButtonDown("Fire1"))
     {        
          Instantiate (GameObject.Find("BubblePrefab"),
             GameObject.Find("SpawnPoint").transform.position, 
             Quaternion.identity);  
 
     }
 }
 
 @script RequireComponent(CharacterController)

And le error... NullReferenceException UnityEngine.Object.Internal_InstantiateSingle (UnityEngine.Object data, Vector3 pos, Quaternion rot) (at C:/BuildAgent/work/6bc5f79e0a4296d6/Runtime/ExportGenerated/Editor/BaseClass.cs:46) UnityEngine.Object.Instantiate (UnityEngine.Object original, Vector3 position, Quaternion rotation) (at C:/BuildAgent/work/6bc5f79e0a4296d6/Runtime/ExportGenerated/Editor/BaseClass.cs:57) MoveAround.Update () (at Assets/Scripts/MoveAround.js:15)

Answer 1

Answer by Borgo · Jun 23, 2011 at 09:23 PM

MissingMethodException: Method not found: 'UnityEngine.Rigidbody.Addforce' The correct is AddForce, with "F" and not "f".

Add comment · Show 1 · Share

GenericFantasy · Jun 23, 2011 at 09:29 PM 0

Share

... facepalm Well now i feel like an idiot, it took ages for me to attempt to figure it out, and thats all it was? Idiot me....

Answer 2

Answer by save · Jun 23, 2011 at 09:37 PM

The missing method is because Unity is case-sensitive, you call:

 bullit.rigidbody.Addforce

when it should say:

 bullit.rigidbody.AddForce

The second error is most likely that you've not wrapped up your prefab into a variable. Have a look at Instantiating Prefabs at Runtime in the docs.

On lines 15-17, instead of doing this:

 Instantiate (GameObject.Find("BubblePrefab"),
 GameObject.Find("SpawnPoint").transform.position, 
 Quaternion.identity);

you should do this:

 Instantiate (bubblePrefab, spawnPoint.transform.position, Quaternion.identity);

Where you first declare bubblePrefab and spawnPoint as variables outside the Update-function:

 var bubblePrefab : GameObject;
 var spawnPoint : Transform;

Add comment · Show 2 · Share

GenericFantasy · Jun 23, 2011 at 09:57 PM 0

Share

Now it says The referenced script on this Behaviour is missing! UnityEngine.Object:Instantiate(Object, Vector3, Quaternion) MoveAround:Update() (at Assets/Scripts/MoveAround.js:17)

And it wont let me assign the spawn point i created to the script. Its an empty gameobject just in front of the character

save · Jun 27, 2011 at 09:59 AM 0

Share

Make sure that the var spawnPoint is set as : Transform in the script (as provided in the example).

Answer 3

on the first on i did have AddForce

but u keep getting this error NullReferenceException UnityEngine.Component.get_transform () (at C:/BuildAgent/work/7535de4ca26c26ac/Runtime/ExportGenerated/Editor/UnityEngineComponent.cs:21) ControlTurret.Shoot (System.Object seconds) (at Assets/Turret/ControlTurret.js:30) ControlTurret.Update () (at Assets/Turret/ControlTurret.js:19)

my javascript:

var LookAtTarget:Transform; var damp = 1; var bullitPrefab:Transform; var saveTime=0;

function Update () {

     if(LookAtTarget)
     {
             var rotate =Quaternion.LookRotation(LookAtTarget.position - transform.position);
             
             transform.rotation = Quaternion.Slerp(transform.rotation,rotate,Time.deltaTime * damp);
             
             var seconds:int = Time.time;
             var oddeven =  (seconds % 2);
             
             if(oddeven)
             {
                     Shoot(seconds);
             }
             
             
     }

}

function Shoot(seconds) {
if(seconds != saveTime) { var bullit = Instantiate(bullitPrefab, transform.Find("spawnpoint").transform.position, Quaternion.identity);

             bullit.rigidbody.AddForce(transform.forward  * 1000);
     
             saveTime=seconds;
     }

}

Missing Method Exception and Null Reference Exception

3 Replies

Your answer

Welcome to Unity Answers

Follow this Question

Related Questions