BuddyPress.org

Which version of BuddyPress are you running?

If you’re using 1.1-beta, then the bp-sn-framework and bp-default directories need to be moved into /wp-content/themes/.

If using an earlier version, then you need to move bphome into /wp-content/themes/ and bpmember into /wp-content/bp-themes/

Also, more suggestions about how to tackle your particular error message can be found here:

https://buddypress.org/forums/topic/buddypress-plugins-and-theme-not-loading

Just one note, if you get to the stage of deleting BuddyPress and starting over with its install, please make sure you deactivate it first before deleting it.