Error when insert citations in openoffice

Ubuntau 9.04, firefox3.5, openoffice 3.0
zotero 2.0b6.5, zotero openoffice intergration 2.0a2

When I click any icon to insert a citation or manage the citations, occur following errors:

An unexpected error occured while performing this operation:

File "/home/weasteam/.openoffice.org/3/user/uno_packages/cache/uno_packages/y8nwI6_/Zotero.oxt/Zotero.py", line 396, in
getFields
fields.soft()

File "/home/weasteam/.openoffice.org/3/user/uno_packages/cache/uno_packages/y8nwI6_/Zotero.oxt/Zotero.py", line 1095, in
getFields
fields.soft()

File "/home/weasteam/.openoffice.org/3/user/uno_packages/cache/uno_packages/y8nwI6_/Zotero.oxt/Zotero.py", line 1140, in __cmp__
return x.wpDoc.text.compareRegionStarts(yRange, Xrange)
com.sun,star.lang.illegalArgumentException

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