problem using amarok

[Luca Ferrari]

Hi,
I'm able to make my laptop sound but when I try to play an mp3 in amarok I get 
a strange behaviour: the player skips to the next song very quickly and no 
play is emitted. Moreover, no errors appears. The same file, reproduced with 
another audio progam works very well. My distro is kubuntu 7.1, is there a 
library or something I must update on my system to get amarok working?

Luca