Error message

BaseStaggeredGrid.java

@Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        super.onCreateView(inflater, container, savedInstanceState);
        View root = inflater.inflate(R.layout.activity_staggered_grid, container, false);
        mGridView = (StaggeredGridView) root.findViewById(R.id.grid_view);
        createOrRestoreGridData(savedInstanceState);
        mGridView.setOnItemClickListener(this);
        mGridView.setOnScrollListener(this);
        return root;
    }

featured_header.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="wrap_content">
    <FrameLayout
        android:id="@+id/featured_banner_fragment"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
    </FrameLayout>

</LinearLayout>

FeaturedFragment.java

public class FeaturedFragment extends BaseStaggeredGridFragment<Offer> {

    private static final String TAG = FeaturedFragment.class.getSimpleName();
    private static final String SAVED_BANNER_TAG = FeaturedFragment.class.getSimpleName() + "_BANNER";
    public static final int POSITION = 0;

    private Market mMarket;
    private View mHeaderView;

    public static FeaturedFragment newInstance(Market market) {
        FeaturedFragment newFrag = new FeaturedFragment();
        Bundle args = new Bundle();
        args.putParcelable(MARKET_DATA_KEY, market);
        newFrag.setArguments(args);
        return newFrag;
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View root = super.onCreateView(inflater, container, savedInstanceState);
        if(mAdapter == null) {
            mAdapter = new StaggeredBaseAdapter<Offer>(getActivity(), Picasso.with(getActivity()), R.layout.offer_leaf );
        }
        mAppState = getResources().getStringArray(R.array.main_activity_tracking)[POSITION];
        mTabPosition = POSITION;
        return root;
    }

    @Override public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        mHeaderView = getActivity().getLayoutInflater().inflate(R.layout.featured_header, null);
        mGridView.addHeaderView(mHeaderView);
        BaseWebviewFragment headerWebview = (BaseWebviewFragment) getChildFragmentManager()
                .findFragmentById(R.id.featured_banner_fragment);

        if (headerWebview == null) {
            headerWebview = new BaseWebviewFragment();
            FragmentTransaction transaction = getChildFragmentManager()
                    .beginTransaction();
            transaction.add(R.id.featured_banner_fragment, headerWebview).commit();
        }
    }

    private void loadBannerUrl(String url) {
        BaseWebviewFragment fragment =
                (BaseWebviewFragment) getChildFragmentManager().findFragmentById(R.id.featured_banner_fragment);
        fragment.updateCurrentUrl(url);
    }

    @Override
    public void onResume() {
        super.onResume();
        Bundle bundle = getArguments();
        String url = NotificationHelper.appendContextParamsForCampaign(getActivity(), getActivity().getString(R.string.banner_url));
        if(!TextUtils.isEmpty(url)) {
            loadBannerUrl(url);
        }
        mGridView.setAdapter(mAdapter);
        mMarket = bundle.getParcelable(MARKET_DATA_KEY);
        if(mMarket != null) {
            if (mData != null && !mData.isEmpty()) {
                checkAdapter();
            } else if(!mHasRequestedMore) {
                offset = 0;
                featuredAPICall(offset);
                mHasRequestedMore = true;
            }
        }
    }

gistfile1.txt

12-16 16:13:13.605  16077-16077/com.staging E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: com.staging, PID: 16077
    java.lang.IllegalArgumentException: No view found for id 0x7f09009e (staging:id/featured_banner_fragment) for fragment BaseWebviewFragment{42fc9768 #0 id=0x7f09009e}
            at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:930)
            at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1115)
            at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
            at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1478)
            at android.support.v4.app.Fragment.performStart(Fragment.java:1521)
            at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:968)
            at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1115)
            at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
            at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1478)
            at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:478)
            at android.support.v4.app.FragmentStatePagerAdapter.finishUpdate(FragmentStatePagerAdapter.java:163)
            at android.support.v4.view.ViewPager.populate(ViewPager.java:1068)
            at android.support.v4.view.ViewPager.populate(ViewPager.java:914)
            at android.support.v4.view.ViewPager.setAdapter(ViewPager.java:442)
            at com.activities.MainActivity.initFragments(MainActivity.java:107)
            at com.activities.MainActivity.access$400(MainActivity.java:43)
            at com.activities.MainActivity$ParseMarketTask.onPostExecute(MainActivity.java:228)
            at com.wanderful.findnsave.activities.MainActivity$ParseMarketTask.onPostExecute(MainActivity.java:194)
            at android.os.AsyncTask.finish(AsyncTask.java:632)
            at android.os.AsyncTask.access$600(AsyncTask.java:177)
            at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:645)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:157)
            at android.app.ActivityThread.main(ActivityThread.java:5356)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1265)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1081)
            at dalvik.system.NativeStart.main(Native Method)

MainActivity.java

    private void initFragments(){
        Intent intent = getIntent();
        int position = intent.getIntExtra(FRAGMENT_POSITION_EXTRA_KEY, mCurrentPage);
        mProgressBar = (ProgressBar) findViewById(R.id.progress_bar);
        PagerSlidingTabStrip tabs = (PagerSlidingTabStrip) findViewById(R.id.tabs);
        mPager = (ViewPager) findViewById(R.id.pager);
        mPager.setOffscreenPageLimit(3);
        mAdapter = new NavPagerAdapter(getResources().getStringArray(R.array.tab_titles), mLocation, mMarket, getSupportFragmentManager());
        //set the adapter to the pager
        //Error is here/////////////////////////////
        mPager.setAdapter(mAdapter); //line 107
        ////////////////////////////////////////////////////////
        mPager.setCurrentItem(position);
        tabs.setViewPager(mPager);
        tabs.setTextSize(MyUtils.spToPixels(this, 12));
        tabs.setOnPageChangeListener(this);
        mProgressBar.setVisibility(View.GONE);
    }