Hello, Forge community! I am trying to make a custom creative tab with hidden items (like command blocks). When I using it on server I get "java.lang.AbstractMethodError: Missing implementation of resolved method 'abstract net.minecraft.world.item.ItemStack m_6976_()' of abstract class net.minecraft.world.item.CreativeModeTab." error. How can I fix this problem?

My code for creative tab:

public class OperatorCreativeTab {
    public static CreativeModeTab OPERATOR_TAB;

    public static void init() {
        OPERATOR_TAB = new CreativeModeTab("operator_tab") {
            @Override
            @OnlyIn(Dist.CLIENT)
            public void fillItemList(NonNullList<ItemStack> list) {
                super.fillItemList(list);

                list.add(Items.COMMAND_BLOCK.getDefaultInstance());
                list.add(Items.CHAIN_COMMAND_BLOCK.getDefaultInstance());
                list.add(Items.REPEATING_COMMAND_BLOCK.getDefaultInstance());
                list.add(Items.COMMAND_BLOCK_MINECART.getDefaultInstance());
                list.add(Items.JIGSAW.getDefaultInstance());
                list.add(Items.STRUCTURE_BLOCK.getDefaultInstance());
                list.add(Items.STRUCTURE_VOID.getDefaultInstance());
                list.add(Items.BARRIER.getDefaultInstance());
                list.add(Items.DEBUG_STICK.getDefaultInstance());

                CompoundTag blockStateTag;
                ItemStack lightBlockWithNbt;

                for(int i = 15; i > -1; i--) {
                    blockStateTag = new CompoundTag();
                    blockStateTag.putInt("level", i);

                    lightBlockWithNbt = Items.LIGHT.getDefaultInstance();
                    lightBlockWithNbt.addTagElement("BlockStateTag", blockStateTag);

                    list.add(lightBlockWithNbt);
                }
            }

            @Override
            @OnlyIn(Dist.CLIENT)
            public ItemStack makeIcon() {
                return Items.COMMAND_BLOCK.getDefaultInstance();
            }

            @OnlyIn(Dist.CLIENT)
            @Override
            public ItemStack getIconItem() {
                return Items.COMMAND_BLOCK.getDefaultInstance();
            }
        };
    }
}

 

Edited August 25, 20232 yr by zimavi

No code in mods should use @OnlyIn

https://forge.gemwire.uk/wiki/Sides#.40OnlyIn

 

I removed it, but it didn't change the error in any way.

I've tried to do something, and it suddenly started working. Parchment mapping helped me.