nginx: [error] invalid PID number ＂＂ in ＂/usr/local/webserver/nginx/logs/nginx.pid＂，nginxnginx.pid

nginx: [error] invalid PID number "" in "/usr/local/webserver/nginx/logs/nginx.pid"，nginxnginx.pid

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

nginx -s reload