'The requested member of the collection does not exist'

Hello all,

I just got Endnote X3 and I am using it with Word 2007. Every time I insert a citation I get the following pop-up:" ‘The requested member of the collection does not exist’. The citation is then inserted, but is not added to list of references. I have tried a previous suggestion in the forum of unformating the document, and while this works (the references are added to the reference list at the end of the document), as soon as I try to add new citations the same pop-up shows up.

Any suggestions?

Thanks,

Jonas