Error: Name already in use, please log in.....

[Newbie9]

I have just installed JComment 2.2.0.0 on Joomla 1.5.17. It is hosted on bplaced.net as a free domain.

I don't have the module for users to register installed on my website.

I want my visitors to be able to post comments without being registered on my website, just like on http://demo.joomlatune.com

Under settings / permissions I left everything as by default (unregistered: post new comment is enabled).

Still when trying to post a comment the above-mentioned error occurs.

Please let me know what to do. Thanks a lot in advance

[smart]

See here: http://www.joomlatune.com/forum/index.php/topic,1641.0.html