2.0b4: getFile() can only be called on attachment items

I'm trying to sync my library on my office PC (Windows XP Professional 2002) with the server, and when I start going through the conflict resolution screens, I invariably hit one item that generates the following error message: "getFile() can only be called on attachment items." That seems to stop the sync. As far as I can tell, it looks like Zotero is trying to merge the record for the Quick Start Guide with a record for an unrelated item in my library. (The error code is 1542420450.)

This doesn't happen on my Macbook at home. Is there anything I can do? Many thanks!

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