BuddyPress.org

This is random, but if I were to give an educated guess–it seems like the toughest part to comprehend initially might be that you don’t put the member themes under the themes file (directory) you put them in wp-contents. Just a guess, hope you figure it out and have fun…

And also, is it possible that you were using the kubrick theme as your home theme instead of the BuddyPress Home Theme? That would give the plugin error.

Also to remove buddypress just remove all contents from mu-plugins and restore your theme to Kubrick.