Domain mapping issue

I just instaled domain mapping on a site and got this error:

You may have some lines in your wp-config.php file that will interfere with the operation of the domain mapping plugin, can you please check and remove the following lines:.

define( 'DOMAIN_CURRENT_SITE', 'sportbloggar.nu' );
define( 'PATH_CURRENT_SITE', '/' );
define( 'SITE_ID_CURRENT_SITE', 1 );
define( 'BLOG_ID_CURRENT_SITE', 1 );

The problem is that if I remove these lines from my config it will redirect visitors of my site to http://domain_current_site

This was an issue caused by the multi-domain plugin.

Will a mapped domain to a sub-domain blog not work if I don't remove these lines?