www site error

I have just seen if I visit the 'www.mysite.tld' I have the following error:

Warning: Cannot modify header information - headers already sent by (output started at /home/mysite/public_html/wp-content/themes/bp-daily-child/functions.php:106) in /home/mysite/public_html/wp-includes/pluggable.php on line 890

If I use http://mysite.tld There are no problems viewing it.

What is causing this error?

I am using WP 3.0.1 and BP

I will do some testing to see whether it is a plugin or not to eliminate that.

[Link edited and backticks removed ~ drmike]