Getting confusing error with domain mapping

I added the line define( 'SUNRISE', 'on' ); and did not comment it out... I can not for the life of me find what I did wrong but am getting the follwoing warning on the plugin's setting page:

Please uncomment the line //define( 'SUNRISE', 'on' ); in the /home/content/......./wp-config.php file.

One strange thing that I have noticed is that I have a wp-config-sample.php and a wp-config.php . I added the line in the wp-config.php and NOT the sample one. I added the line exactly where the directions directed it to go...right between the following two lines:

define('WP_DEBUG', false);

/* That's all, stop editing! Happy blogging. */

I didn't add anything like a slash...etc before or after the sunrise line...