What happen to my main.xml: error parsing xml unbound prefix error
<p>I face an error in my main.xml. It display the error: "error parsing xml unbound prefix" at 

<pre><code>My code 
&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;RelativeLayout 
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" android:background="@drawable/white"
    xmlns:android="http://schemas.android.com/apk/res/android"
    &gt;

&lt;com.facebook.android.LoginButton
        android:id="@+id/login"
        android:src="@drawable/login_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" 
        android:layout_margin="30dp"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"/&gt;
</code></pre>

<p><strong>Error here--></strong>  
        /></p>

<pre><code>    &lt;Button android:id="@+id/infoButton"
        android:text="@string/information"
        android:visibility="invisible"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" 
        android:layout_below="@+id/txt"
        android:layout_alignRight="@+id/txt"
        /&gt;

    &lt;Button android:id="@+id/postButton" 
        android:text="@string/post"
        android:visibility="invisible"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" 
        android:layout_below="@+id/txt"
        android:layout_alignLeft="@+id/txt"
        /&gt;

    &lt;Button android:id="@+id/friendButton" 
        android:text="@string/friend"
        android:visibility="invisible"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" 
        android:layout_below="@+id/postButton"
        android:layout_alignLeft="@+id/postButton"
   /&gt;
   &lt;ListView  
        android:id="@+id/friendsview"
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content"
        android:textFilterEnabled="true"
        android:layout_below="@+id/friendButton"
        android:layout_centerHorizontal="true"
    /&gt;

&lt;/RelativeLayout&gt;
</code></pre>

<p>and in my java files, it display error at the everything relating to R. For example: R.layout.main</p>

<p>Could you please help me? Thank you so much.</p>
