Scribefire setup does not work - firefox and chrome

Setting Up Scribefire with Chrome or Firefox does NOT work currently.
I use the actual Version auf Easyblog and Joomla 3.3.3

I typed in the URL:
http://www.mydomain.de/index.php?option=com_easyblog&controller=xmlrpc

I choosed even wordpress or MetaWeblog (as for Podsy on ipad)
Both options finished with same results as follows.

I typed in für API-URL:
http://www.mydomain.de/index.php?option=com_easyblog&controller=xmlrpc

The error that comes up is:
ScribeFire konnte die notwendigen Informationen über Dein Blog nicht erhalten. Glücklicherweise antwortete Dein Blogserver mit dieser Nachricht: Incorrect parameters passed to method: No method signature matches number of parameters

What is going wrong?

Thanx in advance for your quick response :-)