Error inflating animation resource

I read this example and I'm trying to use it. I put this in drawable folder as somth.xml:

 <animation-list android:id="selected" android:oneshot="false">
    <item android:drawable="@drawable/img1" android:duration="50" />
    <item android:drawable="@drawable/img2" android:duration="50" />
 </animation-list>

I also put it in anim folder I try to add header like:

<?xml version="1.0" encoding="utf-8"?>

But give me an error like this:

Er开发者_开发知识库ror in an XML file: aborting build.

What is wrong?

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Strange, it seems that android:id is not a valid attribute for frame animations.

Try removing that attribute and/or adding xmlns:android="http://schemas.android.com/apk/res/android" to <animation-list>.

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had you inserted required drawable? or you can clean and build the project

Eclipse>Project>clean