jmf and mpeg layer 3

Hi friends, I have a little question in using jmf. I can play (using fobs) any kind of my .avi file but i couldn't here any kind of audio. I have the following error:

Unable to handl mpeg layer 3....

I have downloaded the Java MP3 PlugIn and registrly it with successfully.

How could i fix?

thanks in advance

regards

[362 byte] By [emanuele.ga] at [2007-11-27 6:26:21]