Weird error in a grid snapping script

Unity Engine
1

It says “Object reference not set to an instance of an object” at line 92. I know what’s wrong with generating script math, that isn’t the problem. Any idea what’s wrong?

2

GridCube is most likely null.

3

That’s why this is so wierd. It is not null.

4

Hm. Peculiar. Not entirely sure. If you are simply adding an object to a list, it should not be an issue if the object is properly assigned. You did a check…

… At line 92, just prior,

print("gridCube " + gridCube);

See if this reports an object.

5 
gridCube gridCube(Clone) (UnityEngine.GameObject)
UnityEngine.MonoBehaviour:print(Object)
GridController:snapPoint(GameObject) (at Assets/Game_scripts/GridController.cs:92)
BuildScript:FixedUpdate() (at Assets/Game_scripts/BuildScript.cs:69)

I posted as c# code because of smileys.

6

Bumb.

7

So gridCube exists? it is assigned?

8

If it returns a GameObject I guess so.

9

Unsure man.

10

Well I don’t understand how it could return a value if it isn’t assigned.

11

So you continue to get the same error?

12

Line 92 would throw that error if the list was null - which you set it to in Clear() so my guess is you’re calling Clear and then trying to call snapPoint aftewards without re-initializing the list.

@renman3000 - gridCube can be null. Adding null to a list is allowed.

1 Like
13

Yes, it doesn’t throw that error anymore after commenting use of the Clear function.
Thank you so much, now I think I can fix it.

1 Like
14

So I got some new problems… Updated scripts:

When line 70 in BuildScript is uncommented line it won’t log debug message in line 31. This affects that locaPositionList doesn’t have proper assignation.