Thanks Stephen_C! I've done so, and I'm now getting a different error:
[13:00:51.275] ZotHero[Script Filter] {
"items": [
{
"title": "Error in workflow 'ZotHero'",
"subtitle": "[Errno 2] No such file or directory: '/Users/tobymartin/Zotero/better-bibtex.sqlite'",
"valid": false,
"icon": {
"path": "/System/Library/CoreServices/CoreTypes.bundle/Contents/Resources/AlertStopIcon.icns"
}
}
]
}
I don't know whether "better-bibtex.sqlite" is supposed to be created on-the-fly, but I can confirm that there's no such file in my Zotero folder. I have instead "zotero.sqlite" along with some back-ups.