Buddy Press error

Sorry i didn't find the right category for just buddypress plugin. Someone today tried to create a blog on my wpsitebuilder.net mu installation and this came up:
Fatal error: Cannot redeclare bp_loaded() (previously declared in /home/wpsitebu/public_html/wp-content/plugins/buddypress/bp-loader.php:62) in /home/wpsitebu/public_html/wp-content/plugins/buddypress/bp-loader.phpon line 63

He had registered first without creating a blog and then went to the buddy press link on the bp bar up top, clicked on create a blog and then go the error after filling out the form and clicking on create blog.