Domain Mapping Plugin Issue

I'm following your online instructions for setting up a multisite, using your Domain Mapping plugin. However, as soon as I add the define( 'SUNRISE', 'on' ); line to the wp-config.php file I get this error message:

Error establishing a database connection
If your site does not display, please contact the owner of this network. If you are the owner of this network please check that MySQL is running properly and all tables are error free.

Database tables are missing. This means that MySQL is not running, WordPress was not installed properly, or someone deleted wp_site. You really should look at your database now.

What do I do now? Read the bug report page. Some of the guidelines there may help you figure out what went wrong. If you’re still stuck with this message, then check that your database contains the following tables:

wp_users
wp_usermeta
wp_blogs
wp_signups
wp_site
wp_sitemeta
wp_registration_log
wp_blog_versions

This is a brand new installation of Wordpress with the default theme and no other active plugins.