"Close Zotero. Only one copy of Zotero can be opened at a time"

Anytime I try to open Zotero I get the message "Close Zotero. Only one copy of Zotero can be opened at a time"

I have restarted Safari. Restarted my computer. Closed out of all of my applications. Uninstalled and reinstalled Zotero on Safari. Uninstalled and reinstalled on Firefox. I get the message again every time I try something different.
  • See the answer here: http://apple.stackexchange.com/a/238169
    except for Firefox substitute Zotero in the filepath
  • The link you sent me doesn't make any sense.
  • Sorry, you'd have to be more specific. That's the right link. It provides the answer for the exact same problem with Firefox. Since Zotero is built on the Firefox framework, the solution is the same. If you have trouble following the instructions, please ask specific questions.
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