http://www.domain.com *works* http://domain.com *doesn’t*

I’m a bit flummoxed.

The site in question is lifeinthebighouse.com. If I try to access this via http://www.lifeinthebighouse.com, it works fine. If I try it via http://lifeinthebighouse.com I get the following error:

Warning: Cannot modify header information – headers already sent by (output started at /home3/username/public_html/lifeinthebighouse/cgi-bin/wp-config.cgi(1) : eval()’d code(17) : eval()’d code:120) in /home3/username/public_html/lifeinthebighouse/wp-includes/pluggable.php on line 865

I installed wordpress via simplescripts and have done the same with two other sites which work properly.

Anybody know where the problem is?

Thanks.