Android 4.4 java.lang.IllegalStateException: Fragment already added

[WuShengXi]

FragmentPagerItems.Creator creator = FragmentPagerItems.with(getActivity());

    for (ColumnBean columnBean : columnBeen) {
        TabEntity tabEntity = UIUtils.createrColumnFragment(columnBean, false);
        creator.add(FragmentPagerItem.of(columnBean.getCat_name(), tabEntity.getClassName(), tabEntity.getBundle()));
    }

    FragmentPagerItemAdapter adapter = new FragmentPagerItemAdapter(
            getChildFragmentManager(), creator.create());

    vp_content.setOffscreenPageLimit(1);

    vp_content.setAdapter(adapter);

    stl_tab.setViewPager(vp_content);

[WuShengXi]

ViewPager + Framgent +SmartTabLayout