Duplicate ID, tag null, or parent id with another fragment for com.google.android.gms.maps.MapFragment

I was using Google map API version2 with for one of my application.In layout I was using "com.google.android.gms.maps.MapFragment".

 <RelativeLayout
                        android:id="@+id/relative_disc_nyc_map"
                        android:layout_width="fill_parent"
                        android:layout_height="fill_parent" >

                        <fragment
                            android:id="@+id/frg_disc_nyc_map"
                            android:layout_width="fill_parent"
                            android:layout_height="fill_parent"
                            class="com.google.android.gms.maps.MapFragment" />
             </RelativeLayout>

And while executing I was using the above layout and adding it into fragment.....

public class DiscoverNYCActivity extends Fragment {
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.activity_discover_nyc, container, false);
        lbl_poi_title = (TextView) rootView.findViewById(R.id.lbl_poi_title);
        lbl_rate_count = (TextView) rootView.findViewById(R.id.lbl_rate_count);
return rootView;
}

But when I was travesing to the sam e screen twice.I was giving me below error

06-07 14:41:41.496: E/AndroidRuntime(21037): FATAL EXCEPTION: main
06-07 14:41:41.496: E/AndroidRuntime(21037): android.view.InflateException: Binary XML file line #120: Error inflating class fragment
06-07 14:41:41.496: E/AndroidRuntime(21037): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:719)
06-07 14:41:41.496: E/AndroidRuntime(21037): at android.view.LayoutInflater.rInflate(LayoutInflater.java:761)
06-07 14:41:41.496: E/AndroidRuntime(21037): at com.wf.wholesale.nymta.DiscoverNYCActivity.onCreateView(DiscoverNYCActivity.java:101)
06-07 14:41:41.496: E/AndroidRuntime(21037): at android.support.v4.app.Fragment.performCreateView(Fragment.java:1500)
06-07 14:41:41.496: E/AndroidRuntime(21037): Caused by: java.lang.IllegalArgumentException: Binary XML file line #120: Duplicate id 0x7f090058, tag null, or parent id 0x7f090057 with another fragment for com.google.android.gms.maps.MapFragment
06-07 14:41:41.496: E/AndroidRuntime(21037): at android.app.Activity.onCreateView(Activity.java:4971)
06-07 14:41:41.496: E/AndroidRuntime(21037): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:695)
06-07 14:41:41.496: E/AndroidRuntime(21037): ... 24 more

The problem is that what I was trying was wrong. You shouldn't be inflating fragments inside other fragments. From Android's documentation:

Note: You cannot inflate a layout into a fragment when that layout includes a <fragment>. Nested fragments are only supported when added to a fragment dynamically.

I have resolved the error with below changes.....

public class DiscoverNYCActivity extends Fragment {

View rootView;

    @Override

    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

 if (rootView != null) {

           ViewGroup parent = (ViewGroup) rootView.getParent();

           if (parent != null)

               parent.removeView(rootView);

       }

       try {

        rootView = inflater.inflate(R.layout.activity_discover_nyc, container, false);

       } catch (InflateException e) {

            map is already there, just return view as it is 

       }

        lbl_poi_title = (TextView) rootView.findViewById(R.id.lbl_poi_title);

        lbl_rate_count = (TextView) rootView.findViewById(R.id.lbl_rate_count);

return rootView;

}