Please enter value for Port
>25566

Saving debug log to /var/log/letsencrypt/letsencrypt.log
Plugins selected: Authenticator nginx, Installer nginx
Obtaining a new certificate
Performing the following challenges:
http-01 challenge for play.louka.us
nginx: [error] invalid PID number "" in "/run/nginx.pid"
Cleaning up challenges
nginx: [error] invalid PID number "" in "/run/nginx.pid"
Encountered exception during recovery:
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/certbot/auth_handler.py", line 70, in handle_authorizations
    resps = self.auth.perform(achalls)
  File "/usr/lib/python3/dist-packages/certbot_nginx/configurator.py", line 1134, in perform
    self.restart()
  File "/usr/lib/python3/dist-packages/certbot_nginx/configurator.py", line 919, in restart
    nginx_restart(self.conf('ctl'), self.nginx_conf)
  File "/usr/lib/python3/dist-packages/certbot_nginx/configurator.py", line 1202, in nginx_restart
    raise errors.MisconfigurationError(
certbot.errors.MisconfigurationError: nginx restart failed:
b''
b''

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/certbot/error_handler.py", line 124, in _call_registered
    self.funcs[-1]()
  File "/usr/lib/python3/dist-packages/certbot/auth_handler.py", line 243, in _cleanup_challenges
    self.auth.cleanup(achalls)
  File "/usr/lib/python3/dist-packages/certbot_nginx/configurator.py", line 1152, in cleanup
    self.restart()
  File "/usr/lib/python3/dist-packages/certbot_nginx/configurator.py", line 919, in restart
    nginx_restart(self.conf('ctl'), self.nginx_conf)
  File "/usr/lib/python3/dist-packages/certbot_nginx/configurator.py", line 1202, in nginx_restart
    raise errors.MisconfigurationError(
certbot.errors.MisconfigurationError: nginx restart failed:
b''
b''
nginx restart failed:
b''
b''
[Error] Certbot failed with code 1