Nginx installation Error: Nginx: [ERROR] Invalid PID number

Got a U.S. server, reset the next nginx installation configuration,/usr/local/nginx/sbin/nginx-s reload prompts the following error:

[root@kvmla-201606291067 conf]#/usr/local/nginx/sbin/nginx-s Reload
Nginx: [ERROR] Invalid PID number "" In "/usr/local/nginx/logs/nginx.pid"

Invalid PID number.

Online Search data solutions are as follows:

/usr/local/nginx/sbin/nginx-c/usr/local/nginx/conf/nginx.conf

Re-view the nginx process and it is now started successfully.

[root@kvmla-201606291067 conf]# NETSTAT-TUNLP
Active Internet connections (only servers)
Proto recv-q Send-q Local address Foreign address State Pid/program Name
TCP 0 0 x.x.x.x:8388 0.0.0.0:* LISTEN 11148/python
TCP 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 26066/nginx
TCP 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 17709/sshd

Hereby record.