This question already has answers here:
What is a NullReferenceException, and how do I fix it?
(27 answers)
Closed 11 months ago.
This is an old project of mine. i haven't opened it for some time. As far as i remember it was working perfectly fine. but today when i opend it it stopped working. i haven't change a single line of code. it just stopped working(it builds just fine but dont start after). After a full night of frustration i found the reason of why its not starting but couldn't imagine or find any possible solution, cause it was eorking perfectly fine but suddenly it decided to stop working.
Please help :)
i swear i haven't changed a single line of code. not even a coma.
It's because you have called PopulateGridViewEmployee with an empty searchKey which is an Optional Argument set to Null.
Hence you're getting System.ArgumentNullException
To fix it change the optional argument to have an empty string:
PopulateGridViewEmployee(string searchKey = "")
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This question already has answers here:
What is a NullReferenceException, and how do I fix it?
(27 answers)
Closed 3 months ago.
This post was edited and submitted for review 3 months ago and failed to reopen the post:
Original close reason(s) were not resolved
I'm trying to do a little bit of cleaning up and I seem to be getting the follow
NullReferenceException: Object reference not set to an instance of an
object DestroyCollision.OnCollisionEnter2D (UnityEngine.Collision2D
collision) (at Assets/Scripts/DestroyCollision.cs:66)
Now though, even though the entire script works perfectly (there's literally no bugs or anything) and the object reference is set correctly (since the object in question gets its active state set to false), I am stumped as to why there are any issues. The following code is the line in question:
if (collision.gameObject.tag == "Shield")
{
GameObject.FindGameObjectWithTag("Shield").SetActive(false);
Destroy(this.gameObject);
}
The shield object is properly tagged, and as I said, setactive(false) gets applied. Line 66 is the gameobject.find... of that line of code there.
Why am I getting the error and how to fix it?
Are you sure you mean to have Destroy(this.gameObject); instead of Destroy(collision.gameObject);?
We know collision.gameObject is not null there, but you provide no info on what this.gameObject is.
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:
How to prevent VS Code from auto-deleting tabs on an empty line?
(2 answers)
Closed 1 year ago.
I have this problem that Visual Studio Code doesn't detect indentation properly when moving around with cursor, and actually removes indentation automatically that I have manually added.
Why is it doing this? How do you configure it? Can't seem to find the setting!
Maybe is one of your extensions, have you tried to disable some of then to see if helps ?
This question already has answers here:
What is a NullReferenceException, and how do I fix it?
(27 answers)
Closed 2 years ago.
I am using Visual Studio 2017 with the ASP.NET Core 2.1 Framework. When I try and loop through a static object I have in my controller, the iterator seems to be null.
The static object I am calling definitely has a collection seen below:
However When I try and see what the details are of the iterator I get a null reference exception even through the iterator should have a value:
What would be the cause of this null reference?
EDIT: Thanks to the answer I was able to debug what the issue was.
In the code where I am setting the bool wasFound I am doing a where query against a list of objects where the name of the incoming connection is in the list. In this case, the connection name was null and so it would fail.
Obviously the null reference error was a bit vague as to what was causing the error.
The problem is not with i itself, most probably the incoming instance is null, you can use ?. operator in this case:
i?.incoming?.connection
This question already has answers here:
What is a NullReferenceException, and how do I fix it?
(27 answers)
Closed 3 years ago.
Ive build an UI for a Touchdisplay on Rpi with Windows 10 iot Core.
When I tested this on my PC it worked. If I now test the software on the Raspberry I get an exception on this line(s):
lblTime.Text = DateTime.Now.ToShortTimeString();
lblDay.Text = DateTime.Now.ToString("dddd");
Its an exception of type 'System.NullReferenceException' what means this DateTime.Now is null Right?
The time is set on the Windows Device Portal so idk why there ist no "Now"-Time
I would guess, that lblTime and/or lblDay is null.
You can simply debug this by using a null check (if(lblTime == null) {)
I have now found the Problem. It was just to early(some first lines in the Main Page method), some Code later it worked fine.