Wordpress plugin error message


I use UAW(Unique Article Wizard) Plugin for my wordpress and today i got an error message:

Sorry, there was a problem submitting the test article for dir_id 47266 to http://b2business.co.cc/wp-content/plugins/unique_articles/add_article.php: Error message: HTTP code: 404 for http://b2business.co.cc/wp-content/plugins/unique_articles/add_article.php. Once that page is working, then submissions should work. You may need to contact your hosting company if it is a server configuration error.

Please tell what can go wrong