Custom rating panel?

I have layout.I embedded a custom score bar in it:

<RatingBar
            android:id="@id/rate"
            style="?android:attr/ratingBarStyleSmall"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginRight="5.0dip"
            android:isIndicator="true"
            android:max="5"
            android:numStars="5"
            android:progressDrawable="@drawable/ratebar_theme"
            android:stepSize="0.1" />

      

        
        
        
      

    

This is ratebar_theme

:

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >

    <item
        android:id="@android:id/background"
        android:drawable="@drawable/star_empty_show"/>

    <item
        android:id="@android:id/secondaryProgress"
        android:drawable="@drawable/star_empty_show"/>

    <item
        android:id="@android:id/progress"
        android:drawable="@drawable/star_filled_show"/>

</layer-list>

      

        
        
        
      

    

Both star_empty_show

and star_filled_show

are the .png

files in the folder drawable

of the project. Both of the above codes have no error, but in the tab Graphical layout

I can see this:

Failed to parse file E:\...\res\drawable\ratebar_theme.xml

      

        
        
        
      

    

And in Error Log

I see this:

  org.xmlpull.v1.XmlPullParserException: Binary XML file line #6: <item> tag requires a 'drawable' attribute or child tag defining a drawable

      

        
        
        
      

    

But I am adding an attribute drawable

to each element. Do you know why this error occurs?