Wrong datatype for second argument

Hi.

I recently set up Constant Contact on a clean Drupal install. I configured it, and everything seems fine—no errors on any of the configuration pages, it's properly linking to my Constant Contact account to get the names of my newsletters, etc.

But on the front page, where I have a Constant Contact signup block, I get the following errors.

Warning: in_array() [function.in-array]: Wrong datatype for second argument in constant_contact_signup_form() (line 1020 of /Applications/MAMP/htdocs/d7/sites/wildblossomwines.com/modules/constant_contact/constant_contact.module).
Warning: in_array() [function.in-array]: Wrong datatype for second argument in constant_contact_signup_form() (line 1020 of /Applications/MAMP/htdocs/d7/sites/wildblossomwines.com/modules/constant_contact/constant_contact.module).
Warning: in_array() [function.in-array]: Wrong datatype for second argument in constant_contact_signup_form() (line 1020 of /Applications/MAMP/htdocs/d7/sites/wildblossomwines.com/modules/constant_contact/constant_contact.module).
Warning: in_array() [function.in-array]: Wrong datatype for second argument in constant_contact_signup_form() (line 1020 of /Applications/MAMP/htdocs/d7/sites/wildblossomwines.com/modules/constant_contact/constant_contact.module).

When I put my e-mail address in, I get the following errors:
Notice: Undefined index: cc_newsletter_lists_1 in constant_contact_signup_form_submit() (line 1084 of /Applications/MAMP/htdocs/d7/sites/wildblossomwines.com/modules/constant_contact/constant_contact.module).
Warning: array_keys() [function.array-keys]: The first argument should be an array in constant_contact_signup_form_submit() (line 1139 of /Applications/MAMP/htdocs/d7/sites/wildblossomwines.com/modules/constant_contact/constant_contact.module).
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Warning: in_array() [function.in-array]: Wrong datatype for second argument in constant_contact_signup_form() (line 1020 of /Applications/MAMP/htdocs/d7/sites/wildblossomwines.com/modules/constant_contact/constant_contact.module).
Warning: in_array() [function.in-array]: Wrong datatype for second argument in constant_contact_signup_form() (line 1020 of /Applications/MAMP/htdocs/d7/sites/wildblossomwines.com/modules/constant_contact/constant_contact.module).
Warning: in_array() [function.in-array]: Wrong datatype for second argument in constant_contact_signup_form() (line 1020 of /Applications/MAMP/htdocs/d7/sites/wildblossomwines.com/modules/constant_contact/constant_contact.module).
Warning: in_array() [function.in-array]: Wrong datatype for second argument in constant_contact_signup_form() (line 1020 of /Applications/MAMP/htdocs/d7/sites/wildblossomwines.com/modules/constant_contact/constant_contact.module).

Am I missing something? What is going on?