This question already has answers here:
What is a NullReferenceException, and how do I fix it?
(27 answers)
Closed 2 years ago.
This code is basically using the code from https://gist.github.com/runewake2/b4b7bf73485222f7c5a0fe0c91dd1322strong text
I have already assigned the variable but still got this error. Can anybody tell me how? I watched this guy tutorial and he did it with this code so there shouldn't be a problem I guess.
The problem is that you don't initialize the property private Material material; When you create object like that you create a reference that points to null. In your code you are trying to modify this object but since it's not initialized it's null. The solution is to initialize it in the constructor like so:
public FlowLines()
{
this.material = new Material();
}
Related
This question already has answers here:
What is a NullReferenceException, and how do I fix it?
(27 answers)
Closed 3 months ago.
I am getting this error:
NullReferenceException: Object reference not set to an instance of an object Obstacle.OnTriggerEnter2D (UnityEngine.Collider2D collision) (at Assets/Scripts/Obstacle.cs:22)
There is no problem in the code. Where am I making a mistake?
[[enter image description here](https://i.stack.imgur.com/sSDkt.png)](https://i.stack.imgur.com/PRHdO.png)
Please help.
This is an issue caused by a small typo in the form of a lowercase ‘s’ instead of an uppercase ‘S’.
Because the Unity Engine was looking for Start and couldn’t find it, your “start” code never ran. Because of that, your Player was never assigned to, and had a “null reference”. And that’s why when you tried to read the tag, for a reference that was null, you got the error.
Your code should be:
private void Start ()
{
..
}
Note the exact case for Start and all C# commands.
This question already has answers here:
What is a NullReferenceException, and how do I fix it?
(27 answers)
Closed 7 years ago.
i new to Unity3D, so i take look to tutorials, and bump into issue with error linked in tittle of this thread. So. i Wrote exactly code that this guy wrote, and do also exactly what he do, but get error. I add rigidbody to mine player object. Here picture:
Tutorial: http://unity3d.com/learn/tutorials/projects/roll-a-ball/set-up?playlist=17141
Are you sure the setup() function is ever called, which initializes the rb variable? It seems like this is variable, which is null. Try to replace rb.AddForce(mouvment * speed) with GetComponent<Rigidbody>().AddForce(mouvement * speed);. Alternatively, rename your setup() function to Awake() or Start().
This question already has answers here:
What is the use of static variable in C#? When to use it? Why can't I declare the static variable inside method?
(12 answers)
Closed 7 years ago.
Does anybody know how to modify a static variable from a different script in Unity?
Please, provide more information about how are you trying to do this...
If you need to change between mono behaviours, for example, you will need to get current instance of behaviour you like to change in a way like
myGameObjectInstance.GetComponent<MyBehaviourWithStatic>().myStatic = value;
but note that user2320445 answer is not wrong, it depends on your context. Be more specific on your question and we could provide better and precise answers
This question already has answers here:
What is a NullReferenceException, and how do I fix it?
(27 answers)
Closed 7 years ago.
I have been searching for an answer for 3 days now but cannot seem to find one. Im not an expert coder but have some sort of knowledge in the field.
I am trying to incorporate RevMob AD Network into my application but I keep getting this error when I call the revmob.ShowFullscreen(); in Start().
NullReferenceException: Object reference not set to an instance of an object RevMobSampleAppCSharp.Start () (at Assets/Scripts RevMobSampleAppCSharp.cs:36)
Just create an instance of revmob by the sounds of it...
revmob myRevmob = new revmob();
This question already has answers here:
What is a NullReferenceException, and how do I fix it?
(27 answers)
Closed 8 years ago.
When im trying to set checkbox.checked, i got null refedence exception. I dont know why, it looks like that checkbox isnt initialized.
There is my code
public UpdateProduct(DataGridViewRow row,Form1 form)
{
this.row = row;
this.form = form;
product = row.DataBoundItem as object;
visibilityCheckBox.Checked = true;
InitializeComponent();
}
Exception is firing in line visibilityCheckBox.Checked = true;
Please can anybody help me with this issue ? Thanks much !
I guess you didn't call InitializeComponent before, and since you are trying to set it before the call to InitializeComponent, visibilityCheckBox will be null.
Call InitializeComponent first or write another method that does only update the created UI elements.