Fatal error – help needed URGENTLY

Help needed URGENTLY for non-profit racing the clock to launch a buddy press site! Was using the Studio theme and installed the plug in “buddy press template pack” and got this message:

Fatal error: Cannot redeclare bp_dtheme_ajax_querystring() (previously declared in /nfs/c06/h04/mnt/94946/domains/members.takeroot.org/html/wp-content/themes/studio/_inc/ajax.php:17) in /nfs/c06/h04/mnt/94946/domains/members.takeroot.org/html/wp-content/plugins/buddypress/bp-themes/bp-default/_inc/ajax.php on line 81

Now I cannot access any pages in my site!!! Please help!!!!!!!!