What does unbound prefix mean, when parsing XML?

I Have made a xml file in my android app for the Custom Widget and the error is:

Error parsing XML: unbound prefix

Here is my xml file:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <com.example.CustomWidget.MyView
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"

        android:id="@+id/surface"
        android:focusable="true"
        android:focusableInTouchMode="true"
        android:layout_weight="1"/>

</LinearLayout>

com.example.CustomWidget is the name of my package and MyView is the name of my class file where I made the custom Widget.