XML：尾部不允许内容

Multiple annotations found at this line:
    - error: Error parsing XML: not well-formed 
     (invalid token)
    - Content is not allowed in trailing section.

在这个XML文件上…

<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item 
    android:state_enabled="false"
        android:drawable="@drawable/btn_red" />
    <item 
        android:state_pressed="true" 
        android:state_enabled="true"
        android:drawable="@drawable/btn_orange" />
    <item 
        android:state_focused="true" 
        android:state_enabled="true"
        android:drawable="@drawable/btn_orange" />
    <item 
        android:state_enabled="true"
        android:drawable="@drawable/btn_black" />
</selector>

知道XML的人可能很简单.任何想法？