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Question by Pwnographyz · Jun 10, 2014 at 11:44 PM · nullreferenceexception

NullReferenceException

Hello Unity Community!

It's me again.

So, since I changed my Prefab from being in the Game when it Starts to a (Clone) which gets created shortly later, A NullReferenceException Error pops up in this Line:

 if(!weaponObj.GetComponent<WeaponBehavior>().haveWeapon){

the weaponObj. is declared as:

 weaponObj = PlayerWeaponsComponent.weaponOrder[i];

and the PlayerWeaponsComponent is declared as:

 PlayerWeapons PlayerWeaponsComponent = Camera.main.transform.parent.transform.parent.GetComponentInChildren<PlayerWeapons>();

Code snippet to clarify what happens exactly:

 //find the PlayerWeapons script in the FPS Prefab to access weaponOrder array
         PlayerWeapons PlayerWeaponsComponent = Camera.main.transform.parent.transform.parent.GetComponentInChildren<PlayerWeapons>();
     //scan the children of the FPS Weapons object (PlayerWeapon's weaponOrder array) and assign this item's weaponObj to the
     //weapon object whose weaponNumber in its WeaponBehavior script matches this item's weapon number
     for (int i = 0; i < PlayerWeaponsComponent.weaponOrder.Length; i++)    {
         if(PlayerWeaponsComponent.weaponOrder[i].GetComponent<WeaponBehavior>().weaponNumber == weaponNumber){
             weaponObj = PlayerWeaponsComponent.weaponOrder[i];
             break;
             }
         }
     }
 }
 
 void PickUpItem (){
     //if player does not have this weapon, pick it up
     if(!weaponObj.GetComponent<WeaponBehavior>().haveWeapon){

I can't get behind why it shouldn't find the weaponObj. anymore.

I hope someone can help me with this (:

Your sincerely,

Marco

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avatar image christoph_r · Jun 10, 2014 at 11:50 PM 0
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It seems like you don't have a WeaponBehaviour script on that gameObject. Did you check in paused play mode if it's actually there?

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Answer by Jeff-Kesselman · Jun 10, 2014 at 11:47 PM

When faced with a null pointer error the first thing you should do is determine exactly what is null.

Right before where you have the error insert these lines:

 Debug.Log("weaponObj is "+weaponObj))
 Debug.Log("Component WeaponBehavior is "+weaponObj.GetComponent<WeaponBehavior>());
 

If neither of those returns null then you are wrong about where your error is.

if either of those returns null, it will get you started on finding your problem

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avatar image Pwnographyz · Jun 11, 2014 at 12:16 AM 0
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Ok I faced that the problem is pretty far at the beginning already. I thought I solved this already.

 PlayerWeapons PlayerWeaponsComponent = GameObject.Find("Player(Clone)").GetComponentInChildren<PlayerWeapons>();

Does not work. To clarify:

Player(Clone) is the GameObject that Contains another GameObject called FPS Weapons on that the Script PlayerWeapons is attached. I can't find a solution to access this script.

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