Fatal error while installing theme

I get this Fetal error while I try to install the theme

Fatal error: Cannot redeclare bp_dtheme_ajax_querystring() (previously declared in /home/content/98/6457198/html/xnet/wp-content/plugins/buddypress/bp-themes/bp-default/_inc/ajax.php:20) in /home/content/98/6457198/html/xnet/wp-content/themes/bp-social/_inc/ajax.php on line 63