I'm getting this message: “ERROR: Layout 'picture' not found” when viewing pictures (and “ERROR: Layout 'video_file' not found” for videos) after an upgrade to Nuxeo. I've tried googling the issue but haven't found anyone else with the problem. It was accidentally upgraded, so is it possible to downgrade it back to 7.10 or 8.3? It seems that something is missing from the packages, and after the upgrade I had to reinstall Nuxeo JSF UI and Web UI as these seemed to get remove too.