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?
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