We're sorry, a server error occurred while reading from storage. Error code PERMISSION_DENIED

When I try to manage the document studio add-on within an existing Google Sheets file, I receive the message: “We’re sorry, a server error occurred while reading from storage. Error code PERMISSION_DENIED.” The document studio add-on is working correctly, but I have been unable to manage/edit the workflow for at least one week. I attempted in both Safari and Chrome, with the same error message.