OpenOffice Zotero Integration won't work in Linux

I am unable to get Zotero Open Office Integration plugin working in Open Office. Specs are:
Ubuntu 10.04
Firefox 8.0
OpenOffice 3.2.0
Zotero Office integration 3.5b3
Zotero 2.1.10

I am using Java from Sun, so that shouldn't be a problem.

I have no problem installing the Integration plugin on FF. However, while adding Zotero_OpenOffice_Integration.oxt via OO's extension manager, I get the following error:

`Add Extension(s): /file/to/path/Zotero_OpenOffice_Integration.oxt/types.rdb does not exist`.

I have no idea whether this is a problem with the Integration plugin or with OO. I intended to test whether other extensions work in OO, but the OO extension site (extensions.services.openoffice.org) is down.

TIA.

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