Subscribe with error

Hi Mavros,
since several weeks my subscribing form doesnt work (i just noticed it last week). Error ist always the same:
Mail-Funktion konnte nicht initialisiert werden! --> mail function could not be initialized. Newletter sending works.
I put the subscribe plugin in an item, same problem. Then i tried the free plugin form... it works!

You can see for yourself by subscribing on
http://www.marienhagen-pergenroth.de/hvv/index.php/neues-aus-den-bergdoerfern/805-neue-feuerpyramiden-fuer-den-weihnachtsmarkt

The free version of the plugin works correct. Do you have an idea, what is going wrong?
best regards Klaus

Hello Schaffi and thank you for posting.
Please read the FAQ, Common Problems, question 1.
http://mavxr.com/support/faq/nspro-faq

Please note that you are using an old version of NS Pro (and a very old version of Joomla by the way) and you should definitely update to the latest versions, so that your site keeps working properly.

Thanks again.