System - Joomailer Mailchimp Signup errors

Hello,
I am using this plugin: System - Joomailer Mailchimp Signup and it is causing an error in my profile Edit section. the error I'm getting is: 'Unable to load listSubscribe()! Code=232 Msg=There is no record of the email address "urbanguru182@yahoo.com" in your account' upon clicking Update. This is the email used to create this profile, so it does exist. I am using the latest CB version and the latest Joomla version of the 1.5's. I have a tone of modules, plugins and components, so I don't even know where to start. The site is adventdesign.net/mycom. I can give you an access to the admin if you need to look at it. Let me know what you need. I'd really like to use Mailchimp on my site if possible. Thanks!