ALERT - DATABASE UPGRADE ERROR

I get the following error message whn firing up standalone Zotero - how do I fix this?

Exception.... "Component returned failed code: 0x80520013 (NS_ERROR_FILE_READ_ONLT) [moziStorageConnection.execute SimpleSQL" nsresult: "0x60520013 (NS_ERROR_FILE_READ_ONLY]" location: "JS Frame :: chrome://zotero/content/xpcom/db.js :: Zotero.DBConnection.prototype.query:: line 149" data: no][QUERY : DELETE FROM itemTypesCombined][ERROR: attempt to write a readonly database..
  • Your database is read only. Check file permissions in your zotero data folder. https://www.zotero.org/support/zotero_data

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