Apps ImageButton Issues

[manurules3]

Ok, so when I'm using ImageButton in my xml, and i keep encountering problems when lauching and the console in eclipse says Unable to resolve drawable "....res/drawable/play_button.xml" in attribute "src". Heres my xml code

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:background="@drawable/background"
  android:gravity="bottom|center"
  android:paddingBottom="50px"
  android:id="@+id/main_menu">
[B]<ImageButton
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:id="@+id/playbutton"
  android:src="@drawable/play_button"
  android:background="@drawable/button_background"
  />[/B]
<Button
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:id="@+id/helpbutton"
  android:background="@drawable/helpbutton"
  />
<Button
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:id="@+id/creditsbutton"
  android:background="@drawable/creditsbutton"
  />

</LinearLayout>

And here is the selector imagebutton xml...

<?xml version="1.0" encoding="utf-8"?>
<Selector
xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:state_pressed="true"
android:drawable="@drawable/playbuttonpressed"
/>
<item
android:state_focused="true"
android:drawable="@drawable/playbuttonover"
/>
<item
android:drawable="@drawable/playbutton"
/>
</Selector>

I'm really confused with this error. I used the sdk example and i still get force closes when starting the activity with this menu. Any ideas/solutions? Thanks in advance