Error cannot load certificate "/etc/letsencrypt/live/domainname/fullchain.pem"

I’ve followed this tutorial to obtain the certificate (sudo certbot certonly --nginx):

Docker-compose file:

  nginx:
    restart: always
    hostname: reverse
    image: nginx
    #depends_on:
      #- vue
    networks: ['rasa-network']
    command: '/bin/sh -c ''while :; do sleep 6h & wait $${!}; nginx -s reload; done & nginx -g "daemon off;"'''
    ports:
      - "80:808"
      - "443:4438"
    volumes:
      - ./nginx/conf/conf.d:/etc/nginx/conf.d
      - ./nginx/conf/partials:/etc/nginx/partials
      - ./nginx/certbot/conf:/etc/letsencrypt
      - ./nginx/certbot/www:/var/www/certbot
      - ./nginx/conf/nginx.conf:/etc/nginx/nginx.conf
  certbot:
    image: certbot/certbot
    entrypoint: "/bin/sh -c 'trap exit TERM; while :; do certbot renew; sleep 12h & wait $${!}; done;'"
    volumes:
      - ./nginx/certbot/conf:/etc/letsencrypt
      - ./nginx/certbot/www:/var/www/certbot