Calibre content server on linux error

Hi,
in first, please, excuse my english, but it is nit my mother languages, so...

I have a problem with calibre 0.9.5 on linux.
My distribution is debian 6.0
I install calibre with the command line present on the download page, all is ok.
When i launch calibre, i always have the same error:
"Impossible de démarrer le serveur de contenu. Erreur: Error ('No socket could be created')"
Does anyone have somme idea ?
I will run calibre on my own server in order to share my books with all readers of my familly, on my private network only.

Thanks a lot for your help.
best regards.

Vil_coyotte