error upgrading database

This is my Error Report#: 2125062912.

I upgraded to the 2.0 version a few days ago. I have a few Zotero databases, some small, some large. I attempted to upgrade my largest database and it gave me an error. Here's the text:

[Exception... "Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [mozIStorageConnection.executeSimpleSQL]" nsresult: "0x80004005 (NS_ERROR_FAILURE)" location: "JS frame :: chrome://zotero/content/xpcom/db.js :: anonymous :: line 140" data: no] [QUERY: REINDEX] [ERROR: indexed columns are not unique]

What do I do now?

This is an old discussion that has not been active in a long time. Instead of commenting here, you should start a new discussion. If you think the content of this discussion is still relevant, you can link to it from your new discussion.