Issue opening Grafana with MIT App Inventor Webview

Hey guys, we have porblems entering Grafana with MIT AI2. When were Opening our Grafana page it gives us the following

If you’re seeing this Grafana has failed to load its application files

  1. This could be caused by your reverse proxy settings.
  2. If you host grafana under subpath make sure your grafana.ini root_path setting includes subpath
  3. If you have a local dev build make sure you build frontend using: npm run dev, npm run watch, or npm run build
  4. Sometimes restarting grafana-server can help

Has anybody got an idea?