NewsFox

The version 1 of newfox was ok.
Now I have updated newfox at the version 1.0.1 b4 and doesn't work.
When I try to open a newfox tab this display me this error message:

Errore interpretazione XML: entità non definita
Indirizzo: chrome://newsfox/content/newsfox.xul
Linea numero 262, colonna 11:
----------^

That in english should be:

Error in parsing XML: Entity not defined
Address:chrome://newsfox/content/newsfox.xul
Line number 262, column 11:
----------^

I'm using firefox 3 Beta 5.
If you need more information about my firefox configuration or other to resolve this bug ask to me.
Tank you.
Bye.