google SEO problem

[gunrose2003]

After i installed the Google SEO module.

it shows:

Board URL is set to 'http://rice21.com', but you currently seem to be on 'http://www.rice21.com'. A wrong Board URL setting may cause problems with Redirect.

Add to .htaccess:
# Some hosts require RewriteBase to make RewriteRules work.
RewriteBase /

# Google SEO workaround for search.php highlights:
# Make this rule the first rewrite rule in your .htaccess!
RewriteRule ^([^&]*)&(.*)$ http://rice21.com/$1?$2 [L,QSA,R=301]

# Google SEO 404:
ErrorDocument 404 /misc.php?google_seo_error=404

# Google SEO Sitemap:
RewriteRule ^sitemap-([^./]+)\.xml$ misc.php?google_seo_sitemap=$1 [L,QSA,NC]

# Google SEO URL Forums:
RewriteRule ^Forum-([^./]+)$ forumdisplay.php?google_seo_forum=$1 [L,QSA,NC]

# Google SEO URL Threads:
RewriteRule ^Thread-([^./]+)$ showthread.php?google_seo_thread=$1 [L,QSA,NC]

# Google SEO URL Announcements:
RewriteRule ^Announcement-([^./]+)$ announcements.php?google_seo_announcement=$1 [L,QSA,NC]

# Google SEO URL Users:
RewriteRule ^User-([^./]+)$ member.php?action=profile&google_seo_user=$1 [L,QSA,NC]

# Google SEO URL Calendars:
RewriteRule ^Calendar-([^./]+)$ calendar.php?google_seo_calendar=$1 [L,QSA,NC]

# Google SEO URL Events:
RewriteRule ^Event-([^./]+)$ calendar.php?action=event&google_seo_event=$1 [L,QSA,NC]
404, Meta, Redirect, Sitemap and URL are enabled. (Configure)
Click to Revert changes to core files.

Whats happen? How to solve it?

Thank you in advance