Your AnkiHub database is corrupted. Please follow the steps if you still have the issue:
- Close Anki
- Go to the
~/Library/Application Support/AnkiHubfolder. The Library folder is hidden by default, but can be revealed in Finder by holding down the option key while clicking on the Go menu. - You should see multiple subfolders with random names. Open each subfolder and delete the
ankihub.dbfile.