BP install error message

Hi – any suggestions on how I can fix this?

Thanks

Fatal error: Cannot redeclare bp_dtheme_ajax_querystring() (previously declared in /home/fabufems/public_html/wp-content/themes/blogs-mu/_inc/ajax.php:17) in /home/fabufems/public_html/wp-content/plugins/buddypress/bp-themes/bp-default/_inc/ajax.php on line 157