Multi-domains problem?

Hello,

I tried to set up the multi-domains plugin. I followed the instructions but you see the following error on this site which I want to be part of the network [Edit: Link removed at user request] . I am using a dedicated hosting (not shared). I am using Blue host and have other domains hosted on this account, including the WP multi-site and the site [Edit: Link removed at user request] which I want to be part of the multi-site network: see the screen [Edit: Link removed at user request]

IP address :173.254.13.227

Warning: Cannot modify header information - headers already sent by (output started at /home4/beyondes/public_html/DOMAIN/index.php:48) in /home4/beyondes/public_html/DOMAIN/wp-content/sunrise.php on line 42