Fatal Error

I am getting the following error when I try to load the XMLRPC URL in my browser directly:

Fatal error: Cannot redeclare class IXR_IntrospectionServer in /usr/www/users/zzz/mydomain.com/member/xmlrpc/ixr.inc.php on line 823

I am trying to get xmlrpc integrated with Ultracart. I am really familiar with ultracart, use it for a few ecommerce sites but this is my first attempt at a membership site.

Any help would be appreciated.

So,
I have been tinkering around a bit. My site is also running wordpress.
I removed to code that integrates my wordpress theme and the fatal error goes away.
There is 2 parts to the code.

In the config.inc.php file I added:
define('WP_USE_THEMES', false);
require_once(dirname(__FILE__).'/../wp-config.php'); // assuming amember is installed to folder in root of wp install
global $wp;
if($wp){
$wp->init();
$wp->parse_request();
$wp->query_posts();
$wp->register_globals();
}
Then in site.inc.php I added:
<?
setup_plugin_hook('get_header', 'my_custom_header');
function my_custom_header(&$header, $vars)
{
global $wp;
ob_start();
get_header();
$header = ob_get_contents();
ob_end_clean();
$header .= '<div id="container" class="one-column">'."\n";
$header .= ' <div id="content" role="main">'."\n";
$header .= ' <div id="amember_wrap">'."\n";
$header .= ' <h1 class="entry-title">'.$vars['title'].'</h1>'."\n";
}
setup_plugin_hook('get_footer', 'my_custom_footer');
function my_custom_footer(&$footer, $vars)
{
global $wp;
$footer = ' </div><!-- amember_wrap -->'."\n";
$footer .= ' </div><!-- content -->'."\n";
$footer .= '</div><!-- container -->'."\n";
ob_start();
//get_sidebar();
$footer .= ob_get_contents();
ob_end_clean();
ob_start();
get_footer();
$footer .= ob_get_contents();
ob_end_clean();
} // end footer
?>

If I remove this code there are no problems. I want the code to work, there has got to be a simple fix that I am not seeing...

This did not help.