我学习NodeJS。我有安装了nodejs的ubuntu 16服务器。然后我安装全球快递发电机和永远。接下来，我将一个文件夹写入名为hack-it-up.ru的/ var / www中，并使用express-generator生成应用程序。接下来，我将我的应用程序的端口更改为8081并尝试使用npm start启动它。一切正常。但是......当我试图永远启动我的应用程序时，我遇到了错误。我引用了许多指南，但没有解决它。请帮帮我。谢谢！
root@ashipka:/var/www/hack-it-up.ru# forever start -l /var/www/forever-logs/hack-it.log -a app.js
warn: --minUptime not set. Defaulting to: 1000ms
warn: --spinSleepTime not set. Your script will exit if it does not stay up for at least 1000ms
info: Forever processing file: app.js
root@ashipka:/var/www/hack-it-up.ru# forever list
info: Forever processes running
data: uid command script forever pid id logfile uptime
data: [0] aj4I /usr/local/bin/node app.js 27060 27066 /root/.forever/aj4I.log STOPPED
data: [1] wFf4 /usr/local/bin/node app.js 27147 27153 /var/www/forever-logs/hack-it.log STOPPED
root@ashipka:/var/www/hack-it-up.ru# forever stop 0
error: Forever cannot find process with id: 0