koobas.hobune.stream
Object reference not set to an instance of an object
When i cut down a tree i get "NullReferenceException: Object reference not set to an instance of an object cutTree.Update ()"
I dont know what i am doing wrong? This is my code:
var trees: GameObject[];
var bullitPrefab:Transform;
function Start() {
trees = GameObject.FindGameObjectsWithTag("Tree");
}
function Update() {
if(Input.GetButton("placeLog")) {
for(var tree in trees) {
if(tree == null)
continue;
if(Vector3.Distance(tree.transform.position, transform.position) < 5)
{
Instantiate(bullitPrefab, GameObject.Find("logSpawn").transform.position, Quaternion.Identity);
Destroy(tree);
break;
}
}
}
}
could i have some help please
$$anonymous$$ultiple questions is fine as long as they're not all the same thing.
But these are. I closed the older one.
@vicenti, you might want to know that there are 3 identical questions. Please close this one as well. I have add in the information from that question into this question.
@turbinator, I wouldn't eat a horrible-looking but edible food unless I have no choice. Please make your code cleaner and more presentable, those who will answer your question have a choice not to. I have formatted and clean up the codes for you this once.
NullReferenceException in general
You already have a check if(tree == null) in there, so I assume you are knowledgeable enough to understand that variables like trees and bullitPrefab can be empty (eg. hold the value null instead of an actual object).
If you try to call a method (`trees.Sort()`) or attempt to access a property (`tree.transform`) on an empty variable, you get a NullReferenceException.
The easiest way to find such issues is by running your script with the MonoDevelop debugger attached because it puts you on the exact line where it occurred (Unity Documentation: Debugger). Attaching the debugger is currently a bit complicated, but knowing how to do it helps with lots of issues.
In your code
For the code you posted, trees could be null if there are no trees in your scene (because GameObject.FindGameObjectsWithTag() returns null instead of a zero-length array if no game objects are found),
The inline call to GameObject.Find("logSpawn") could return null, too, and cause the exception.
Also, bullitPrefab could be null, but I don't believe Instantiate would throw a NullReferenceException when being handed a null prefab.
