LivingEntity Screen (no Inventory)

[derTeuton]

Description

For my Mod i wanted to make an 'AdvisorEntity extends PassiveEntity implements Ownable', which should tell the Player what he can do with the Mod. The idea was, that the Player has to find this Advisor in the World and Hire him, so the Advisor need a Screen with a Button where he can be Hired

So I used the interactMob Method to open the Screen, where he should be Hireable through a Button:

@Override
    protected ActionResult interactMob(PlayerEntity player, Hand hand) {
        if (owner== null) { // owner is a 'private PlayerEntity', which should save the Player, which hired him
            LOGGER.info("Advisor interaction");
            MinecraftClient.getInstance().setScreen(new HireScreen(MinecraftClient.getInstance().currentScreen));
            return ActionResult.SUCCESS;
        }
        return ActionResult.PASS;
    }

Because the Advisor doesnt need an Inventory I tried it with a normal Screen:

@Environment(EnvType.CLIENT)
public class HireScreen extends Screen {
    private static final Identifier TEXTURE = new Identifier(MOD_ID, "textures/gui/container/hire.png");
    private AdvisorEntity advisor; private final Screen parent;

    public HireScreen(MinecraftClient client, Screen parent, AdvisorEntity advisor) {
        super(Text.of("Advisor")); this.client = client;
        this.advisor = advisor; this.parent = parent;

    }


    public ButtonWidget hireButton = ButtonWidget.builder(Text.of("Hire"), button -> {
        System.out.println("You hired this Advisor!");
        advisor.getsHiredBy(client.player);
    })
            .dimensions(width / 2 - 205, 20, 200, 20)
            .tooltip(Tooltip.of(Text.literal("Tooltip of button1")))
            .build();

    @Override
    protected void init() { addDrawableChild(hireButton); }

    @Override
    public void render(DrawContext context, int mouseX, int mouseY, float delta) {
        int imageWidth = 512; int imageHeight = 256;
        int x = ((width - imageWidth) / 2); int y = ((height - imageHeight) / 2);
        context.drawTexture(TEXTURE,x,y,0,0,imageWidth,imageHeight,imageWidth,imageHeight);
        super.render(context, mouseX, mouseY, delta);
    }

    @Override
    public void close() { client.setScreen(parent); }
    
}

The problem with this is, that the Game crashes with the error, that this Screen isnt correctly initialized and that i called setScreen on the worng Thread.