"but this is the http;//www.darkemud.com/joomla just do a simple register and test it out."

"Thank you for registering at DarkeMUD. Your account is created and must be activated before you can use it.
To activate the account click on the following link or copy-paste it in your browser:"

Which leads to:

"500 - An error has occured

An error has occurred while processing your request.

Please try one of the following pages:

Home Page

If difficulties persist, please contact the System Administrator of this site.

Layout "default_message" not found"