AYUDA 503 - Service Not Available

[frank.ernesto]

Cuando reinicio  PHP-FPM me da el siguiente error:

Killing php-fpm
pkill: Cannot open pidfile '/var/run/php-fpm.pid' : No such file or directory
Starting php-fpm
[ERROR] [pool lighty] cannot get gid for group 'whell'
[ERROR] FPM initialization failed