Message suggests file needs to be updated

When I click the Network Admin > Settings > Domain Mapping and Domains links I get this message:
Please edit your (server info removed)/wp-config.php and move the line define( 'SUNRISE', 'on' ); above the last require_once() in that file or make sure you updated sunrise.php.

I have edited the wp-config.php file according to Multi-Domains package instructions. The sunrise.php file should be up to date -- it was copied from the plugin files installed in August. Am I supposed to be seeing this message or is something not quite right with my setup?