fatal error upon buddypress registration

setting up a new site, wp 4.1

when completing buddypress registration and submitting, new user receives the following fatal error:

Fatal error: Cannot redeclare class Mailchimp_Folders in /home/content/p3pnexwpnas06_data02/20/2369020/html/wp-content/plugins/mailchimp-sync/mailchimp-api/Mailchimp/Folders.php on line 3

on the backend the user is successfully registered but not added to mailchimp