A new error message

I was just testing out a couple other themes, but decided to go back to BP Social.

I'm now getting this error though whenever I try to activate it:

Fatal error: Cannot redeclare bp_dtheme_ajax_querystring() (previously declared in /home/wryterz/public_html/wp-content/themes/bp-social/_inc/ajax.php:17) in /home/wryterz/public_html/wp-content/plugins/buddypress/bp-themes/bp-default/_inc/ajax.php on line 81