Problem with LibreOffice

HI, I can't get the pluging to work with libreoffice ( I'm using Ubuntu Natty Narwhal). When I try the manual installation I get an error saying:

( {{Message="Se ha producido un error al habilitar: Zotero.jar", Context= ( @7f566c04c210}, Cause=(any) {({{Message="",Context=(}}}}

And then nothing happens, wha can I do?

Thanks a lot.
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