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;

}

Eclipse Error : Using 1.7 requires using Android Build Tools version 19 or later; currently using 17.0.0 ?

The project shows this error when relevant build tool is not set for the Project.
First goto Eclipse-->Windows--->Android SDK Manager and installed the relevant build tool required by the application.After installation is completed close the SDK manager.

Then add the below line in "project.properties" file of then prject.Error will be resolved.

sdk.buildtools=19.1