enter image description hereenter image description here error: incompatible types: FirebaseRecyclerAdapter<Category,MenuViewHolder> cannot be converted to Adapter

   FirebaseRecyclerAdapter<Category, MenuViewHolder>   adapter = new FirebaseRecyclerAdapter
            <Category, MenuViewHolder>(
            Category.class,
            R.layout.menu_item,
            MenuViewHolder.class,
            category) {
        @Override
        protected void populateViewHolder(MenuViewHolder menuViewHolder, Category category, int i) {

            menuViewHolder.txtMenuName.setText(category.getName());
            Picasso.get().load(category.getImage()).into(menuViewHolder.imageView);
            progressDialog.dismiss();

        }
    };

    recycler_menu.setAdapter(adapter);
    adapter.notifyDataSetChanged();


  

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