New Pro Sites install: Getting error when activating new site

After creating a new user/blog, I correctly get this activation email:

To activate your blog, please click the following link:

http://orangecounty.quietlyworking.org/wp-activate.php?key=26e8a3f54ee08e8b

When I click the link I get this error: Fatal error: Call to undefined function wp() in /home3/tigheasl/public_html/wp-blog-header.php on line 14

When I look at the wp network backend, there is no new site or user listed, however, when I look at the database, there is an entry in the wp_signups table for the new site.