hey I got the exact same problem that (word for word):

but I can't access NetworkHooks (nearly sure it got deleted between "forge for 1.20.1" and "forge for 1.20.2").

How do I get that Un- FriendlyByteBuff to be not null ?

2 hours ago, Florion111 said:

How do I get that Un- FriendlyByteBuff to be not null ?

You can use IForgeServerPlayer.openMenu()

You just saved my life, Thanks!!!

 

For those still wondering, I'm leaving my fixed "use" method right here :

	@Override
    public InteractionResult use(BlockState pState, Level pLevel, BlockPos pPos, Player pPlayer, InteractionHand pHand, BlockHitResult pHit) {

        if (!pLevel.isClientSide()) {
            BlockEntity entity = pLevel.getBlockEntity(pPos);
            if(entity instanceof LightForgeBlockEntity) {

                IForgeServerPlayer thePlayer = (IForgeServerPlayer) pPlayer;
                thePlayer.openMenu((LightForgeBlockEntity) entity, pPos);

            } else {
                throw new IllegalStateException("Our Container provider is missing!");
            }
        }

        return InteractionResult.sidedSuccess(pLevel.isClientSide());
    }

I'll get the register too, because it's primordial to have IForgeMenuType with that :

public static final RegistryObject<MenuType<LightForgeMenu>> LIGHT_FORGE_MENU =
            MENUS.register("light_forge_menu", () -> IForgeMenuType.create(LightForgeMenu::new));

Thanks again and have a nice day/week/month/forever and ever

1 hour ago, Florion111 said:

Thanks again and have a nice day/week/month/forever and ever

No problem, glad to be of help