An error has occurred :-(

The application did not load. Usual causes:

1. The client was not built: run ./npmw run webapp:build, or use the dev server (./npmw start, port 9000).
2. The Rust service is not running: start it with ./npmw run rust:start (port 8080).
3. A wrong Node.js version: ./npmw installs the pinned one; Node 25 and newer break the build's tests.

See README.md for the full setup.