title: Android FragmentTabHost : No tab known for tag null
body: <p>I used below code and it is not render graphical layout. display error as <code>Exception raised during rendering: No tab known for tag null</code>.</p>
  
  <p>how can i solve this ?</p>
  
  <pre><code>&lt;android.support.v4.app.FragmentTabHost xmlns:android="http://schemas.android.com/apk/res/android"
      android:id="@android:id/tabhost"
      android:layout_width="match_parent"
      android:layout_height="match_parent" &gt;
  
      &lt;LinearLayout
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          android:orientation="vertical" &gt;
  
          &lt;TabWidget
              android:id="@android:id/tabs"
              android:layout_width="match_parent"
              android:layout_height="wrap_content"
              android:layout_weight="0"
              android:orientation="horizontal" /&gt;
  
          &lt;FrameLayout
              android:id="@android:id/tabcontent"
              android:layout_width="0dp"
              android:layout_height="0dp"
              android:layout_weight="0" /&gt;
  
          &lt;FrameLayout
              android:id="@+id/realtabcontent"
              android:layout_width="match_parent"
              android:layout_height="0dp"
              android:layout_weight="1" /&gt;
      &lt;/LinearLayout&gt;
  
  &lt;/android.support.v4.app.FragmentTabHost&gt;
  </code></pre>