ConsumerOfCocaCola

I am trying to add a new item, but It says that It cant resolve symbol ItemGroup. For some reason it doesn't let me import item group because it cant resolve "Item" or something. I am using the latest MDK with IntelliJ Idea. I am having an error with Item.Properties().group and the one after that. public static final RegistryObject<Item> SODA = ITEMS.register("soda", () -> new Item(new Item.Properties().group(ItemGroup.MATERIALS)));