Hey, you clicked the link! But i’m afraid this is not the correct way to create a page, you need to specify your own page name instead of a_new_page, so go on, do it!

public class ExampleMod implements ModInitializer {
 
    // an instance of our new item
    public static final Item CUSTOM_ITEM = new Item(new FabricItemSettings());
 
    @Override
    public void onInitialize() {
        class_2378000.method_10230000(class_7923000.field_41178000, new class_2960000("tutorial", "custom_item"), CUSTOM_ITEM);
    }
}