Something stopped the application starting. Refresh the page — that fixes it most of the time. If it keeps happening, check your internet connection, and if it still will not load, let Mourad know what you were doing when it happened.
Developers: this fallback also appears when index.html is opened directly
from disk. The application is built by Vite — run
npm install && npm run dev, or
npm run build && npm run preview for a production
check.