No adapter attached; skipping layout error You're working so hard. Help me crying

public class frag extends ActionBarActivity{
    private LinearLayoutManager lLayout;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_frag);
        setTitle(null);

        Toolbar topToolBar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(topToolBar);
        topToolBar.setLogo(R.drawable.logo);
        topToolBar.setLogoDescription(getResources().getString(R.string.logo_desc));

        List<Itemobject> rowListItem = getAllItemList();
        lLayout = new LinearLayoutManager(frag.this);

        RecyclerView rView = (RecyclerView) findViewById(R.id.recycler_view);
        rView.setLayoutManager(new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.VERTICAL));
        RecyclerViewAdapter rcAdapter = new RecyclerViewAdapter(frag.this, rowListItem);
        rView.setAdapter(rcAdapter);
    }
    public static class Main extends Fragment{
        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                 Bundle savedInstanceState) {
            return inflater.inflate(R.layout.activity_frag, null);
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {

        int id = item.getItemId();


        if (id == R.id.action_settings) {
            return true;
        }
        if (id == R.id.action_refresh) {
            Toast.makeText(frag.this, "Refresh App", Toast.LENGTH_LONG).show();
        }
        if (id == R.id.action_new) {
            Toast.makeText(frag.this, "Create Text", Toast.LENGTH_LONG).show();
        }

        return super.onOptionsItemSelected(item);
    }

    private List<Itemobject> getAllItemList() {

        List<Itemobject> allItems = new ArrayList<Itemobject>();
        allItems.add(new Itemobject("United States", R.drawable.newyork));
        allItems.add(new Itemobject("Canada", R.drawable.canada));
        allItems.add(new Itemobject("United Kingdom", R.drawable.uk));
        allItems.add(new Itemobject("Germany", R.drawable.germany));
        allItems.add(new Itemobject("Sweden", R.drawable.sweden));

        return allItems;
    }
  }
}