Error: the 'Citation Style' field is completely empty
When I want to add a citation in a new document, the 'Document preferences' window opens but the 'Citation Style' field is completely empty. This also happens when I want to add a citation in an existing document in which I have already chosen the document preferences. Restarting Zotero and MS Word and even my desktop itself doesn't solve the problem. My Zotero is up-to-date and the Microsoft Word add-in has been installed. Does anyone know how to solve this issue?
You will need to re-add any citation styles you installed.
If you're not using any CSL styles you customized yourself, you could try to reset all styles. Again via the preferences ("Advanced" tab, "Files and Folders" tab, "Reset Styles..." button).