How to fix Listen EADDRINUSE in ubuntu - node.js

Question

How can I resolve this issue?
1|server | at listenInCluster (net.js:1327:12)
1|server | at Server.listen (net.js:1414:7)
1|server | at Object.<anonymous> (/root/signalmaster/server.js:41:8)
1|server | at Module._compile (internal/modules/cjs/loader.js:776:30)
1|server | at Object.Module._extensions..js (internal/modules/cjs/loader.js:787:10)
1|server | at Module.load (internal/modules/cjs/loader.js:653:32)
1|server | at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
1|server | at Function.Module._load (internal/modules/cjs/loader.js:585:3)
1|server | at Object.<anonymous> (/usr/local/lib/node_modules/pm2/lib/ProcessContainerFork.js:27:21)
1|server | code: 'EADDRINUSE',
1|server | errno: 'EADDRINUSE',
1|server | syscall: 'listen',
1|server | address: '::',
1|server | port: 8080 }
My server and turnserver status is Online but our clients can't communicate or see each other.
UPDATE:
see this pm2 list

Answer 1

try in the console :
killall node
and the problem should be fixed

Answer 2

The following IP address already used. In same IP address you can run the server by different ports. The port must be opened.
* If it's live server and already running httpd .
<VirtualHost *:80>
ServerName api.xxxx.com
#DocumentRoot /var/www/test
CustomLog /var/www/test/access.log common
ErrorLog /var/www/test/error.log
UseCanonicalName Off
UserDir disabled
<Location "/">
ProxyPreserveHost On
ProxyPass http://localhost:8080/
ProxyPassReverse http://localhost:8080/
</Location>
</VirtualHost>