Cannot configure OTR anymore on Tor Messenger 0.2.0b2

Hello,

As specified in ticket #20229 (closed), the "OTR Preferences" menu is not labeled correctly. Moreover, I have the following error when clicking on this menu: {{{XML Parsing Error: undefined entity Location: chrome://otr/content/prefs.xul Line Number 6, Column 1:<prefwindow id="otr-prefwindow" ^}}}

I hadn't this error before, I even tried to reinstall Tor Messenger in a new directory but unsuccessfully, still this error.

Trac:
Username: PZajda