Android error : Error parsing XML: not well-formed (invalid token) for background image

Android error : Error parsing XML: not well-formed (invalid token) for
background image

i am new to android development
and when i am put image background than i am get this error :
this is my code :
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".Click_Page"
android:background="@layout/img" >
</RelativeLayout>



Error Log : error: Error parsing XML: not well-formed (invalid token)
img.png /AmcostApp/res/layout line 1 Android AAPT Problem



please need solution
thanks in advance