I’m having a similar issue.
Warning: Missing argument 3 for MailChimp_API::get(), called in /home/silver/public_html/londonsacredharp/wp-content/plugins/mailchimp/mailchimp.php on line 841 and defined in /home/silver/public_html/londonsacredharp/wp-content/plugins/mailchimp/lib/mailchimp/mailchimp.php on line 21
Success, you’ve been signed up! Please look for our confirmation email.
Here’s the information you asked for above.
londonsacredharp.org
Mailchimp plugin version 1.5.3
PHP version 5.5.38
WordPress 4.6.1 running a slightly modified child theme of ‘Decent’
With the Twenty Fifteen theme activated, no message appears saying to check your Inbox for a confirmation email but the email does come through. There is also no Warning message.
