C# can_instance: Cannot instance script because the class could not be found.

Question

E 0:00:01.131   can_instance: Cannot instance script because the class 'Interface' could not be found. Script: 'res://Interface.cs'.
  <C++-Fehler>  Method failed. Returning: __null
  <C++-Quellcode>modules/mono/csharp_script.cpp:2942 @ can_instance()
  <Stacktrace>  :0 @ Int32 Godot.NativeCalls.godot_icall_1_187(IntPtr , IntPtr , System.String )()
                SceneTree.cs:637 @ Godot.Error Godot.SceneTree.ChangeScene(System.String )()
                SceneChanger.cs:24 @ Boolean 

I don't know why it says class can not be found. The node with that script is in the scene tree. There are also no compiler errors or anything. Any ideas?

Answer 1

looks like an old question but since I't the first in google It might still be useful.

I don't know exactly what is happening here, but I have a similar problem. I found that if the constructor code (or field initialization) raise an exception this is the error you get.
moving the suspicious code to _ready helped me discover the hidden exception

Answer 2

I had this same issue, but I managed to find and fix it.

From what i can tell, it happens when the name of the script(i.e. "PlayerMovement.cs"), doesn't match the "class name" (i.e. "public class Player : Node").

Just replace the "class name" with the file name.
(I.E. "public class PlayerMovement : Node").

Hope this helps.