[Plugin: ProPlayer] Can’t play MP3

Well, I tested with some MP3 players at

http://www.weblogistan.de

and I can’t get ProPlayer to play the mp3.
the file http://www.weblogistan.de/wp-content/uploads/2010/06/2005_4.mp3 is not played, getting an error:

No suitable model found for playback of this file.

Did I miss something?

Cheers, Connie