I realise this comment is almost four years old, but I started getting the same message today out of the blue.
I re-installed Zotero Standalone, removed and re-added the Chrome extension, rebooted, and still I get this message.
How did it 'fix itself' for you?
I re-installed Zotero Standalone, removed and re-added the Chrome extension, rebooted, and still I get this message.
How did it 'fix itself' for you?