warning: parse_url(http:///statuses/update.xml - Twitter module will not post to twitter

Hi, I get the following error whenever I try to post a new story:

warning: parse_url(http:///statuses/update.xml) [function.parse-url]: Unable to parse URL in /home/httpd/html/sexgenderbody.com/public_html/includes/common.inc on line 420.

I have tried changing permissions, reinstalling, deleting, uninstalling, upgrading and it still won't work. Does anyone have any idea what this might be?

Here is the output from my status report:

Drupal 6.13
Access to update.php Protected
Configuration file Protected
Cron maintenance tasks Last run 3 sec ago
You can run cron manually.
Database updates Up to date
Drupal core update status Up to date
File system Writable (public download method)
GD library bundled (2.0.34 compatible)
Job queue There are no queued jobs.
Module and theme update status Up to date
MySQL database 5.0.68
PHP 5.2.9
PHP memory limit 128M
PHP register globals Disabled
SimplePie library 1.2
Unicode library PHP Mbstring Extension
Update notifications Enabled
Upload progress Enabled (PECL uploadprogress)
Web server Apache/2.2.0 (Fedora)
Zlib library Enabled