下面这个布局什么地方错了？有人知道吗？我的软件不能运行。。报错

Question

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >
    
<LinearLayout
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="horizontal"
    tools:context=".MainActivity" >    <com.example.viewswitcher.SlidingSwitcherView
        android:id="@+id/slidingLayout"
        android:layout_width="fill_parent"
        android:layout_height="100dip" >        <LinearLayout
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:orientation="horizontal" >            <Button
                android:layout_width="fill_parent"
                android:layout_height="fill_parent"
                android:background="@drawable/huazhuangpin" />            <Button
                android:layout_width="fill_parent"
                android:layout_height="fill_parent"
                android:background="@drawable/waimai" />            <Button
                android:layout_width="fill_parent"
                android:layout_height="fill_parent"
                android:background="@drawable/xuewei"/>            <Button
                android:layout_width="fill_parent"
                android:layout_height="fill_parent"
                android:background="@drawable/fushi"/>
        </LinearLayout>        <LinearLayout
            android:layout_width="60dip"
            android:layout_height="20dip"
            android:layout_alignParentBottom="true"
            android:layout_alignParentRight="true"
            android:layout_margin="15dip"
            android:orientation="horizontal" >
        </LinearLayout>
    </com.example.viewswitcher.SlidingSwitcherView></LinearLayout></RelativeLayout>