pm2-test项目
运行 npm run prd报错

“prd”:“cross-env NODE_ENV=production pm2 start app.js”

报错内容：

> 07.pm2-test@1.0.0 prd e:\03-MY\Node\NodeDemo\07.pm2-test
> cross-env NODE_ENV=production pm2 start app.js
connect EPERM //./pipe/rpc.sock
[PM2] Spawning PM2 daemon with pm2_home=C:\Users\elva\.pm2
events.js:174
      throw er; // Unhandled 'error' event
      ^

Error: connect EPERM //./pipe/rpc.sock
    at PipeConnectWrap.afterConnect [as oncomplete] (net.js:1097:14)
Emitted 'error' event at:
    at Socket.<anonymous> (C:\Users\elva\AppData\Roaming\npm\node_modules\pm2\node_modules\pm2-axon\lib\sockets\sock.js:201:49)
    at Socket.emit (events.js:189:13)
    at emitErrorNT (internal/streams/destroy.js:82:8)
    at emitErrorAndCloseNT (internal/streams/destroy.js:50:3)
    at process._tickCallback (internal/process/next_tick.js:63:19)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! 07.pm2-test@1.0.0 prd: `cross-env NODE_ENV=production pm2 start app.js`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the 07.pm2-test@1.0.0 prd script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\elva\AppData\Roaming\npm-cache\_logs\2019-05-01T12_33_00_214Z-debug.log