MailChimp Error - When "Adding New Site" - WordPressMU

I attempted to create a new site on my MU Network. Site was created properly, but got the following error:

Warning: MailChimp listSubscribe() Error: 104 - API Key can not be blank in /home/content/58/8530558/html/foundersyncnetwork/wp-content/plugins/mailchimp-sync/mailchimp-sync.php on line 106

Warning: MailChimp listSubscribe() Error: 104 - API Key can not be blank in /home/content/58/8530558/html/foundersyncnetwork/wp-content/plugins/mailchimp-sync/mailchimp-sync.php on line 106

Warning: Cannot modify header information - headers already sent by (output started at /home/content/58/8530558/html/foundersyncnetwork/wp-content/plugins/mailchimp-sync/mailchimp-sync.php:106) in /home/content/58/8530558/html/foundersyncnetwork/wp-includes/pluggable.php on line 881

Wanted to let you know so that you can repair in next update.

MailChimp Plugin is "Network Activated" when error was created.