command to open screen failed

[Enaium]

       CommandRegistrationCallback.EVENT.register((dispatcher, dedicated) -> {
            dispatcher.register(CommandManager.literal("test").executes(context -> {
                MinecraftClient.getInstance().setScreen(new TestScreen());
                return Command.SINGLE_SUCCESS;
            }));
        });

java.lang.IllegalStateException: [fabric-screen-api-v1] The current screen (net.minecraft.client.gui.screen.Screen) has not been correctly initialised, please send this crash log to the mod author. This is usually caused by the screen not calling super.init(Lnet/minecraft/client/MinecraftClient;II)V
	at net.minecraft.client.gui.screen.Screen.ensureEventsAreInitialised(Screen.java:1824)
	at net.minecraft.client.gui.screen.Screen.fabric_getBeforeTickEvent(Screen.java:1837)
	at net.fabricmc.fabric.api.client.screen.v1.ScreenEvents.beforeTick(ScreenEvents.java:150)
	at net.minecraft.client.MinecraftClient.handler$zem000$beforeScreenTick(MinecraftClient.java:5013)
	at net.minecraft.client.MinecraftClient.method_1572(MinecraftClient.java:1721)
	at net.minecraft.client.gui.screen.Screen.wrapScreenError(Screen.java:491)
	at net.minecraft.client.MinecraftClient.tick(MinecraftClient.java:1721)
	at net.minecraft.client.MinecraftClient.render(MinecraftClient.java:1086)
	at net.minecraft.client.MinecraftClient.run(MinecraftClient.java:733)
	at net.minecraft.client.main.Main.main(Main.java:238)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:568)
	at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:608)
	at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:77)
	at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23)
	at net.fabricmc.devlaunchinjector.Main.main(Main.java:86)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Thread: Render thread
Stacktrace:
	at net.minecraft.client.gui.screen.Screen.ensureEventsAreInitialised(Screen.java:1824)
	at net.minecraft.client.gui.screen.Screen.fabric_getBeforeTickEvent(Screen.java:1837)
	at net.fabricmc.fabric.api.client.screen.v1.ScreenEvents.beforeTick(ScreenEvents.java:150)
	at net.minecraft.client.MinecraftClient.handler$zem000$beforeScreenTick(MinecraftClient.java:5013)
	at net.minecraft.client.MinecraftClient.method_1572(MinecraftClient.java:1721)
	at net.minecraft.client.gui.screen.Screen.wrapScreenError(Screen.java:491)

[warjort]

The error says your TestScreen class is not doing the init() correctly.

java.lang.IllegalStateException: [fabric-screen-api-v1] The current screen (net.minecraft.client.gui.screen.Screen) has not been correctly 
initialised, please send this crash log to the mod author. This is usually caused by the screen not calling
super.init(Lnet/minecraft/client/MinecraftClient;II)V

But your overall approach is wrong.

The commands run on the server, you cannot use the client api directly from them.

If you want to change the screen from a command running on the server,
you will need to send a network message to the player telling their client to do the open.
https://fabricmc.net/wiki/tutorial:networking

IIRC, I think you also need to make sure you do the setScreen() on the render thread rather than the network thread.
i.e. In your network receive code

// Add the screen open to the render thread tasks
MinecraftClient.getInstance().execute(() -> // screen open code here);

(I think adding this execute indirection would probably also fix your current code? i.e. make it run on the client's render thread, but that would only work because you are running the server in co-located client mode it is the wrong thing to do in general).

Fabric does have a client command api. I have personally never used it.
It is intended for commands that don't need the server to do anything.
https://github.com/FabricMC/fabric/tree/1.18.2/fabric-command-api-v1/src/main/java/net/fabricmc/fabric/api/client/command/v1
But it might be enough to get your simple test working?

[Enaium]

thanks