    502 Bad Gateway [TyE502BGW]

    Talkyard's Nginx server cannot connect to Talkyard's application server.
    Is the application server not running, or is there some network error?

    Please check if the 'app' Docker container is running:  'docker-compose ps'

    If it's not running:
    - Start it:  'docker-compose start app'. Then wait a few seconds and reload this page.
    - Or login in a Bash shell:  'docker-compose run --rm --service-ports app bash'

    If it is running:
    - Check the logs:  'docker-compose logs'
    - Only Play's logs: 'docker-compose logs app'
    - Or jump into the container:  'docker-compose exec app bash'