"Copy of Zotero Is Already Open" error message

mklem
I just updated my Mac, and now when I try to open Zotero, I get the error message "A Copy of Zotero Is Already Open. Only One Copy of Zotero Can Be Open at a Time" (image attached). But Zotero is not open, so now I can't use the program. Any suggestions?
https://s3.amazonaws.com/zotero.org/images/forums/u2608503/x20f7k5ozq2bmyzj4q16.png
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