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error trying to implement react-native maps

I'm trying to integrate google maps into my react native app I keep getting this error.
events.js:183
throw er; // Unhandled 'error' event
^
Error: listen EADDRINUSE :::8081
at Server.setupListenHandle [as _listen2] (net.js:1360:14)
at listenInCluster (net.js:1401:12)
at Server.listen (net.js:1485:7)
at C:\projects\test\node_modules\metro\src\index.js:205:18
at new Promise (<anonymous>)
at Object.<anonymous> (C:\projects\test\node_modules\metro\src\index.js:204:12)
at Generator.next (<anonymous>)
at step (C:\projects\testnode_modules\metro\src\index.js:58:30)
at C:\projects\test\node_modules\metro\src\index.js:69:15
at <anonymous>

Assuming you are using Linux.
It seems that your process is locked. In a terminal type the following:
ps -aux | grep '8081
copy the process ID
type in the terminal
sudo kill -9 ID-HERE replace ID-HERE with the process ID.
Restart the application.
If you are using Windows
type Ctrl+SHIFT+Esc to open the process window
Look for your process
Right click on the process and choose end process
Restart the application

Node JS Random events.js:72 throw er;

I know this has been raised a lot of times on here, other threads suggest that the port is already in use and that's why it crashes.
In this case, it's been running for days, using that port and will randomly crash with this error. It's had the port locked for days with no problems and is literally the only daemon on the server.
We're running on port 3000.
events.js:72
throw er; // Unhandled 'error' event
^
Error: getaddrinfo ESRCH
at errnoException (dns.js:37:11)
at Object.onanswer [as oncomplete] (dns.js:124:16)
Any help would be grateful

stdin.write throws Error: write EPIPE

I'm getting this error when openssl child proccess is trying to write() to local directory.
Connection is closed before write() is called. It isn't connected with the ssl, because I can't even launch example code from nodejs documentation.
What am I missing? Some kind of special rights for nodejs?
Please, can anyone give me a real example how to use childProccess.stdin.write()?
events.js:85
throw er; // Unhandled 'error' event
^
Error: write EPIPE
at exports._errnoException (util.js:746:11)
at Socket._writeGeneric (net.js:690:26)
at Socket._write (net.js:709:8)
at doWrite (_stream_writable.js:301:12)
at writeOrBuffer (_stream_writable.js:288:5)
at Socket.Writable.write (_stream_writable.js:217:11)
at Socket.write (net.js:634:40)
at signManifest (...\node_modules\passbook\lib\pass.js:360:14)

It appeared that i've installed openssl in a wrong way. An error (wrong openssl directory) while execFile(openssl) emitted 'close' event, so write threw EPIPE.
Be careful and add a lot of proper error handlers :)

gulp-webserver error occured sometimes

events.js:85
throw er; // Unhandled 'error' event
^
Error: getaddrinfo ENOTFOUND localhost
at errnoException (dns.js:44:10)
at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:94:26)
When I ran 'gulp' command, I met this error, but I don't know how to solve it. I also meet this error when I ran gulp serve command, so I guess this error was caused by gulp-webserver.
My gulp serve task in gulpfile.js is here.
gulp.task('serve', function() {
gulp.src('app/')
.pipe(webserver({
livereload: true,
directoryListening: true,
open: true
}));
});
Please tell me how to solve this problem.

Problem was with hosts file on Mac Yosemite. To correct behavior in /private/etc/hosts was added following line:
127.0.0.1 localhost

How to solve process.nextTick error?

I am using node.js to build a TCP server and I got the following errors. How to solve this?
node.js:134
throw e; // process.nextTick error, or 'error' event on first tick
^
Error: ETIMEDOUT, Connection timed out
at Socket._readImpl (net.js:163:14)
at Socket._onReadable (net.js:631:22)
at IOWatcher.onReadable [as callback] (net.js:177:10)

Try handling the 'error' event on the TCP server you created. All unhandled 'error' events cause an unhandled exception on node.js