Zotero desktop app won’t open

anoushkalad · February 27, 2023

I am currently using a MacBook Air (newest version) and keep receiving the following error message when I try to upload my Desktop application: "A copy of Zotero is already open. Only one copy of Zotero can be open at a time.” I have attempted to uninstall and reinstall the app as well as “Force Quit” the application when I receive the message, however neither attempts to troubleshoot have worked.

dstillman · February 27, 2023

Have you restarted your computer?

By "upload" do you mean "update"? As in Help → "Check for Updates…"?

adamsmith · February 27, 2023

If restarting doesn't work, try
1. https://forums.zotero.org/discussion/56692/mac-solution-a-copy-of-zotero-is-already-open-only-one-copy-of-zotero-can-be-open-at-a-time-err (finding and ending zotero-bin in the activity monitor) or
2. https://forums.zotero.org/discussion/comment/271895/#Comment_271895 (removing the .parentlock file)