BuddyPress.org

This sounds like an mu problem zanzoon. bp doesn’t have much to do with the backend of mu. Have you searched the mu forums? https://mu.wordpress.org/forums/

Have you googled for that error msg with ‘wordpress’ as one of the keys?

Looks like you are trying to modify a setting in the options page of mu and it doesn’t like what you are doing. I can’t tell you why from the info you’ve given.