title: Error Running Android When Change Background
body: <p>I have file bacground_im.png at drawable.
  when I change background at Activity_main.xml I got error.</p>
  
  <p>How to resolve problem?</p>
  
  <pre><code>&lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
                  xmlns:tools="http://schemas.android.com/tools"
                  android:orientation="vertical"
                  android:layout_width="fill_parent"
                  android:layout_height="fill_parent"
                  android:gravity="center_horizontal"
                  android:background="@drawable/background_im"&gt;
  </code></pre>