WPMU Daily AJAX crash

Dear Sir,

I just installed the BP Daily Themes, but suddenly my WP 3.0 got crash. Would you mind to tell me what is going on, and what should I do? The report said:

Fatal error: Cannot redeclare bp_dtheme_ajax_querystring() (previously declared in /home/sinauo5/public_html/sinau.me/wp-content/plugins/buddypress/bp-themes/bp-default/_inc/ajax.php:20) in /home/sinauo5/public_html/sinau.me/wp-content/themes/bp-daily/_inc/ajax.php on line 63

I have used WP 3.0, BuddyPress, and multiple hosting. Just started the blogs since two weeks, previously not using BuddyPress, also use other themes.

Thanks a lot for your support in advance.