Membership 2 Mailchimp addon PHP fatal error

Hi,

I've just tried to add the Membership 2 Mailchimp addon but when trying to access the settings for it I see the following error instead of its settings:

Fatal error: Uncaught Error: Cannot use object of type WP_Error as array in /var/www/vhosts/distillventures.com/accelerate.distillventures.com/wp-content/plugins/membership/lib/mailchimp-api/Mailchimp.php:61 Stack trace: #0 /var/www/vhosts/distillventures.com/accelerate.distillventures.com/wp-content/plugins/membership/lib/mailchimp-api/Mailchimp.php(77): M2_Mailchimp->_request('GET', 'lists', Array) #1 /var/www/vhosts/distillventures.com/accelerate.distillventures.com/wp-content/plugins/membership/lib/mailchimp-api/Mailchimp.php(124): M2_Mailchimp->_get('lists', Array) #2 /var/www/vhosts/distillventures.com/accelerate.distillventures.com/wp-content/plugins/membership/app/addon/mailchimp/class-ms-addon-mailchimp.php(393): M2_Mailchimp->get_lists(25, 0) #3 /var/www/vhosts/distillventures.com/accelerate.distillventures.com/wp-content/plugins/membership/app/addon/mailchimp/class-ms-addon-mailchimp-view.php(100): MS_Addon_Mailchimp::get_mail_lists() #4 /var/www/vhosts/distillventures.com/accelerate.distillventures.com/wp-cont in /var/www/vhosts/distillventures.com/accelerate.distillventures.com/wp-content/plugins/membership/lib/mailchimp-api/Mailchimp.php on line 61

Thanks,
Jon