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Question by ace11575x · Jan 26, 2017 at 10:44 PM · null reference exception

Null object after Instantiation

Hello Everyone,

I am looking for someone that can explain why immediately after creating an instance of a script with passed in parameters it is immediately null. attached are images!][1] from debug that show the instance being created with the values passed and immediately after in the editor getting a null reference exception.

 private void Awake()
   {
     //Assign defualt weapon
     test = new Weapon(99, 5, .5f, 0, "M1911 Pistol");
   }


alt text

alt text

editor.png (129.4 kB)
watch.png (10.6 kB)
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avatar image StuwuStudio · Jan 27, 2017 at 12:26 AM 0
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Can you show me the script used for instantiating or you try to use "new Weapon" to create the new weapon?

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Answer by HenryStrattonFW · Jan 27, 2017 at 06:30 PM

Assuming that "Weapon" is of type "MonoBehaviour" then this is because you cannot create a MonoBehaviour using the new keyword.

To create a new instance of a MonoBehaviour type you need to either create a new game object and then use AddComponent() on it. Or use GameObject.Instantiate to create a new instance of a prefab.

https://docs.unity3d.com/ScriptReference/Object.Instantiate.html

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avatar image ace11575x · Jan 31, 2017 at 03:04 PM 0
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HenryStrattonFTW, Thank you for your answer this was indeed the problem. I was unfamiliar with how to use the constructors for what would be a component and not a C# object. using the AddComponent() method worked.

Thank you

avatar image NoseKills ace11575x · Jan 31, 2017 at 04:08 PM 0
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If the answer is correct, please mark it correct with the button next to it.

avatar image HenryStrattonFW ace11575x · Jan 31, 2017 at 08:08 PM 0
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No worries ace, I remember having the same adjustments problems when I first started using Unity having never used the type of component approach it uses before.

Good luck with your project!

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