Server error 500 about ralph HOT 4 OPEN

git clone https://github.com/allegro/ralph.git
cd ralph/docker
cp -a docker-compose.yml{,.original}
vim docker-compose.yml                        # Edit the value "80:80" to "8080:80" in nginx section if you wish

##docker compose build                        # This line does not need to be executed
##docker compose run --rm web /root/init.sh   # This line does not need to be executed
##docker compose run --rm web ralph demodata  # This line does not need to be executed
docker compose up -d

docker exec -it --user root docker-web-1 /bin/bash
/var/local/ralph/docker-entrypoint.sh init    # Initializing database
/opt/ralph/ralph-core/bin/ralph demodata      # Optional step for demodata
exit

open http://0.0.0.0:8080/                     # ralph:ralph -> OK