FragmentTabHost질문입니다.

Question

<android.support.v4.app.FragmentTabHost
      android:id="@+id/tabhost1"
   android:layout_width="fill_parent"
   android:layout_height="48dp"
   android:layout_weight="0"
   android:padding="2dp">
   <LinearLayout
             android:layout_width="fill_parent"
             android:layout_height="fill_parent"
             android:orientation="vertical">
             <FrameLayout
                 android:id="@android:id/tabcontent"
                 android:layout_width="0dp"
                 android:layout_height="0dp"
                 android:layout_weight="0" />
             <TabWidget
                 android:id="@android:id/tabs"
                 android:layout_width="fill_parent"
                 android:layout_height="fill_parent"
                 android:orientation="horizontal" />
         </LinearLayout>
  </android.support.v4.app.FragmentTabHost>

이부분만.. 넣으면 xml에

Exception raised during rendering: No tab known for tag null
Exception details are logged in Window > Show View > Error Log

 

이런 에러 문구가 뜨네요.. 하..도무지 알수가 없습니다..

 

혹시 SherlockFragmentActivity 액티비티라..그런건가요?