I am trying to run a MERN stack application on an ubuntu server. I have used pm2 to run my server.js and I have used the npm build command to create the static assets in the build folder. Here is my /etc/nginx/sites-available/osnvision file :

server {
        listen 80;

        root /var/www/html/osnvision/client/build;
        index index.html index.htm;

        server_name 192.168.210.38;

        location / {
        proxy_pass http://192.168.210.38:5000;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_cache_bypass $http_upgrade;
        }
}

Here is my pm2 server-error log:

WARNING: NODE_APP_INSTANCE value of '1' did not match any instance config file names.
WARNING: See https://github.com/lorenwest/node-config/wiki/Strict-Mode
{ Error: listen EADDRINUSE :::5000
    at Server.setupListenHandle [as _listen2] (net.js:1346:14)
    at listenInCluster (net.js:1387:12)
    at Server.listen (net.js:1475:7)
    at Function.listen (/var/www/html/osnvision/node_modules/express/lib/application.js:618:24)
    at Object.<anonymous> (/var/www/html/osnvision/server.js:45:5)
    at Module._compile (internal/modules/cjs/loader.js:654:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:665:10)
    at Module.load (internal/modules/cjs/loader.js:566:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:506:12)
    at Function.Module._load (internal/modules/cjs/loader.js:498:3)
    at Object.<anonymous> (/usr/lib/node_modules/pm2/lib/ProcessContainerFork.js:27:21)
    at Module._compile (internal/modules/cjs/loader.js:654:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:665:10)
    at Module.load (internal/modules/cjs/loader.js:566:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:506:12)
    at Function.Module._load (internal/modules/cjs/loader.js:498:3)
  errno: 'EADDRINUSE',
  code: 'EADDRINUSE',
  syscall: 'listen',
  address: '::',
  port: 5000 }

My server.js runs on port 5000. I am getting all kinds of ngins errors like Bad Gateway(502), Cannot get/ (404) and sometimes only the first index.html runs but the other pages are not found. Please help me figure out my mistake. I am new to this. Any help would be appreciated. Thank you.