AddChild fires error: get_fetched_method_unknown_params: Condition !methods_fetched is true.

MagiusCHE

Hi guys. After 3 days of wandering inside the Documentation and Google i just have no other choice to ask help here.

My problem is simple: i can create a simple button and when i press it this code will fired

var instance = ((PackedScene)ResourceLoader.Load("res://assets/ACErr.tscn")).Instance();
AddChild(instance);
Log("AddChield TEST");

...and it works like a charm....

So, I created a more complex project and i added the code below (for testing purpose) inside the main node of my scene (a Spatial).

public bool AddChild_Now = false;
public override void _Process(float delta)
{
	if (AddChild_Now)
	{
		AddChild_Now = false;
		var instance = ((PackedScene)ResourceLoader.Load("res://assets/ACErr.tscn")).Instance();
		AddChild(instance);
		Log("AddChield TEST");
	}
}

and the results is this:

E 0:00:01.840   get_fetched_method_unknown_params: Condition "!methods_fetched" is true. Returned: __null
  <Sorgente C++>modules/mono/mono_gd/gd_mono_class.cpp:264 @ get_fetched_method_unknown_params()
  <Analisi dello stack>:0 @ void Godot.NativeCalls.godot_icall_2_420(IntPtr , IntPtr , IntPtr , Boolean )()
                Node.cs:525 @ void Godot.Node.AddChild(Godot.Node , Boolean )()
                LocalWorldWrapper.cs:31 @ void LocalWorldWrapper._Process(Single )()

I dunno why it happends, couse i tried to replicate in other clean project but it appears only here!

So my question is: "What means this error?, How can i go out of this?"

Thx in advance for all your help and sorry for my poor english!

PS: i cant provide a simple test case but if you want i can share my entire project.

I'm on Linux Manjaro - Godot Engine v3.2.3.stable.mono.official - OpenGL ES 3.0 Renderer: GeForce GTX 980/PCIe/SSE2

TwistedTwigleg

Welcome to the forums @MagiusCHE!

Does the scene you are loading have any scripts attached or anything? If so, have you made sure that those scripts are not causing the issue? I haven't seen an issue like what you are getting from the Godot console myself, but I have noticed with C# that sometimes scripts behaving unexpectedly can give strange issues. I might suggest trying to load a scene with a Spatial/Node2D/Control node without anything attached to see if you can rule out whether the scene itself is causing the issue or not.

MagiusCHE

WTFFFF..... i found THE bug.... but...first of all thx for your answere!

I try to detail it here.

The script attached to the PackedScene that i load and add as child is this:

public class IGChunkWrapper : SpatialWrapper
{
...
}

where SpatialWrapper is another my class like that:

public class SpatialWrapper : Spatial
{
...
}

To solve the problem i just need to CHANGE the original class name (and file) from IGChunkWrapper to IGChunkWrapperFAKE (and IGChunkWrapperFAKE.cs)

After this change all works without errors!!!!!

WTF is this???

(just to clarify if i put back the original name IGChunkWrapper the exception appears again).

Btw, at least now I can just move forward.

Thx man! (now i will report it to godot github).