preferences do not work in 1.5-preview

If I try to open the preferences-window in 1.5, I get the following message:

XML-Verarbeitungsfehler: Nicht definierte Entität
Adresse: chrome://zotero/content/preferences/preferences.xul
Zeile Nr. 330, Spalte 2: <prefpane id="zotero-prefpane-styles"
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