AAPT: error: junk after document element

I HAVE a error in android studio (AAPT: error: junk after document element.) when i want to run my project, your suggestion will be appreciated this is my code;

<GridView     android:layout_width="match_parent"     android:layout_height="match_parent"     android:id="@+id/gridView"     android:numColumns="4"     android:stretchMode="columnWidth"     >  </GridView>