SimplePie Issue with Theme and Plugin in Wordpress

I have a plugin, FeedWordPress, that is conflicting with my theme and resulting in the following error: Fatal error: Cannot redeclare class SimplePie_Cache_MySQL in /home1/public_html/wp-content/themes/aggregator/php/[login to view URL] on line 9073 Upon research I have found that it is because the theme is lacking the following call: // Include the required SimplePie library. if(!class_exists("SimplePie")) { require_once $simplepiefile; } The plugin, does test to see if it exists, so the solution is in the theme and I will need the code updated so that I can use this plugin with this theme.