How to fix "Error: listen EADDRINUSE: address already in use :::2212" in node js?

I'm new to node js. I have created a node js on my CentOS7 server, and this is my server.js file with the config of port is 2212:

.
.
.
.

app.get('*', function(req, res) {
    res.redirect('https://visitor.maharaja.id'); 
});

const db = mysql.createConnection({
  host: '192.168.200.121',
  user: 'root',
  password: 'rahasia',
  database: 'wav4'
});
 
db.connect((err) =>{
  if(err) throw err;
  console.log('Mysql Connected...');
});

const configs = {
    port: 2212, // custom port to access server
    url_callback : 'https://visitor.maharaja.id/WASenderPro/helper/callback.php'
};

cron.schedule('5 * * * *',  function() {
  console.log('cronjob berjalan')
  const savedSessions = getSessionsFile();

.
.
.
.

server.listen(configs.port, function () {
    console.log('App running on *: ' + configs.port);
});

And when i run those code with the command "node server.js", i got this error message:

node:events:505
      throw er; // Unhandled 'error' event
      ^

Error: listen EADDRINUSE: address already in use :::2212
    at Server.setupListenHandle [as _listen2] (node:net:1372:16)
    at listenInCluster (node:net:1420:12)
    at Server.listen (node:net:1508:7)
    at Object.<anonymous> (/var/www/html/WASenderPro/server.js:478:8)
    at Module._compile (node:internal/modules/cjs/loader:1105:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1159:10)
    at Module.load (node:internal/modules/cjs/loader:981:32)
    at Function.Module._load (node:internal/modules/cjs/loader:822:12)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:77:12)
    at node:internal/main/run_main_module:17:47
Emitted 'error' event on Server instance at:
    at emitErrorNT (node:net:1399:8)
    at processTicksAndRejections (node:internal/process/task_queues:83:21) {
  code: 'EADDRINUSE',
  errno: -98,
  syscall: 'listen',
  address: '::',
  port: 2212
}

But, when I change the port to 8181 or another port, i got this different error messages:

App running on *: 8181
Mysql Connected...
node:events:505
      throw er; // Unhandled 'error' event
      ^

Error: Connection lost: The server closed the connection.
    at Protocol.end (/var/www/html/WASenderPro/node_modules/mysql/lib/protocol/Protocol.js:112:13)
    at Socket.<anonymous> (/var/www/html/WASenderPro/node_modules/mysql/lib/Connection.js:94:28)
    at Socket.<anonymous> (/var/www/html/WASenderPro/node_modules/mysql/lib/Connection.js:526:10)
    at Socket.emit (node:events:539:35)
    at endReadableNT (node:internal/streams/readable:1345:12)
    at processTicksAndRejections (node:internal/process/task_queues:83:21)
Emitted 'error' event on Connection instance at:
    at Connection._handleProtocolError (/var/www/html/WASenderPro/node_modules/mysql/lib/Connection.js:423:8)
    at Protocol.emit (node:events:527:28)
    at Protocol._delegateError (/var/www/html/WASenderPro/node_modules/mysql/lib/protocol/Protocol.js:398:10)
    at Protocol.end (/var/www/html/WASenderPro/node_modules/mysql/lib/protocol/Protocol.js:116:8)
    at Socket.<anonymous> (/var/www/html/WASenderPro/node_modules/mysql/lib/Connection.js:94:28)
    [... lines matching original stack trace ...]
    at processTicksAndRejections (node:internal/process/task_queues:83:21) {
  fatal: true,
  code: 'PROTOCOL_CONNECTION_LOST'
}

Thanks in advance for anyone who can help me.