I set up the MailChimp (https://drupal.org/project/mailchimp) module by following the readme file. I've enabled all the Mailchimp modules and added the API key to my drupal instance. I've created and Sent one campaign through MailChimp however, when I go to /admin/config/services/mailchimp/campaigns the page is blank. I've cleared the cache but the page is still blank. I was expecting to see the campaign I sent earlier but it is not there.
What am I doing wrong or missing?