Error message: settings

I've just installed z 1.5 sync prev. When I try to go to action --> settings I get the following error in a pop-up, with firefox 3.0, win xp sp2:

Errore interpretazione XML: entità non definita
Indirizzo: chrome://zotero/content/preferences/preferences.xul
Linea numero 330, colonna 2: <prefpane id="zotero-prefpane-styles"
--------^

Error code 429165645

See you
Paolo
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