Resource.Load() causes "MissingMemberException"

[inaunius]

Godot Version

4.2.1 Stable Mono

Question

Hi, im trying to load saved resource (SettingsRES) via ResourceLoader.Load() but I always get this error

E 0:00:01:0396   ScriptManagerBridge.cs:146 @ Godot.NativeInterop.godot_bool Godot.Bridge.ScriptManagerBridge.CreateManagedForGodotObjectScriptInstance(nint, nint, Godot.NativeInterop.godot_variant**, int): System.MissingMemberException: Cannot create script instance. The class 'DisplaySettingsRES' does not define a parameterless constructor.
  <C# Error>     System.MissingMemberException
  <C# Source>    /root/godot/modules/mono/glue/GodotSharp/GodotSharp/Core/Bridge/ScriptManagerBridge.cs:146 @ Godot.NativeInterop.godot_bool Godot.Bridge.ScriptManagerBridge.CreateManagedForGodotObjectScriptInstance(nint, nint, Godot.NativeInterop.godot_variant**, int)
  <Stack Trace>  ScriptManagerBridge.cs:146 @ Godot.NativeInterop.godot_bool Godot.Bridge.ScriptManagerBridge.CreateManagedForGodotObjectScriptInstance(nint, nint, Godot.NativeInterop.godot_variant**, int)

You can see the loader code here:

private void LoadOrInitAll() {
    var currentPath = FullPath(CURRENT_NAME);
    var backupPath = FullPath(BACKUP_NAME);

    if (ResourceLoader.Exists(currentPath)) {
        _current = ResourceLoader.Load(currentPath) as SettingsRES;
    } else {
        _current = DefaultSettings();
        GDConsole.Log("Current settings load failed, creating new...");
    }
    
    if (ResourceLoader.Exists(backupPath)) {
        _current = ResourceLoader.Load(backupPath) as SettingsRES;
    } else {
        _current = DefaultSettings();
        GDConsole.Log("Current settings load failed, creating new...");
    }

}

And the resource that being loaded:

using Architecture.Services;
using Godot;


[GlobalClass]
public partial class SettingsRES : Resource {
    public SettingsRES(DisplaySettingsRES display, SoundSettingsRES sound) {
        Display = display;
        Sound = sound;
    }


    [Export] public DisplaySettingsRES Display { get; private set; }
    [Export] public SoundSettingsRES Sound { get; private set; }
}

Links:
Resources, I’m troubling to load
Loader script

What could I do wrong?
I’ll be looking forward your response. Thanks in advance!

[paulloz]

Hi! The error message should be quite explicit.

The class ‘DisplaySettingsRES’ does not define a parameterless constructor.

You’re asking Godot to instantiate an object of type SettingsRES(through calling ResourceLoader.Load(...), but that type does not define a parameterless constructor. That is a requirement for all types instantiated by the engine.

Resources

[inaunius]

Thanks a lot! For some reason I didn’t pay attention to that.