Image Swipe Using View Pager inside Fragment

Question

I am trying to create a swiping images inside fragment. I had created tabbed activity using view pager and this is working fine. In one of the tab I am trying to create Image swipe.

public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View view= inflater.inflate(R.layout.fragment_collection_fragment1, container, false);
    ViewPager viewPager= (ViewPager)view.findViewById(R.id.collection1_viewPager);

    ImageSwipeAdapter imageSwipeAdapter= new ImageSwipeAdapter(getActivity().getSupportFragmentManager());
    viewPager.setAdapter(imageSwipeAdapter);
    return view;
}

After deploying this the app stops working.

In some internet content it was mention to use

getChildFragmentManager()

but it was also not working. What is the issue with the code?

Adapter code for Image Swipe

public class ImageSwipeAdapter extends FragmentStatePagerAdapter {
public ImageSwipeAdapter(FragmentManager fm) {
    super(fm);
}

@Override
public Fragment getItem(int position) {
    Fragment f= new ImageSwipe();
    Bundle args= new Bundle();
    args.putInt("count", position + 1);
    f.setArguments(args);
    return f;
}

@Override
public int getCount() {
    return 3;
}

}

Fragment XML-

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com">

<android.support.v4.view.ViewPager
    android:layout_width="match_parent"
    android:layout_height="500dp"
    android:id="@+id/collection1_viewPager">

</android.support.v4.view.ViewPager>

<TextView
    android:id="@+id/textView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentStart="true"
    android:layout_alignParentTop="true"
    android:layout_marginStart="160dp"
    android:layout_marginTop="203dp"
    android:text="TextView" />