nativescript emulator displays nothing

I have two major issues when running both emulators:

1 - When I run the android emulator it invokes the emulator but then comes with the below message and stops running:

Error: getaddrinfo ENOTFOUND localhost undefined:5554
    at errnoException (dns.js:27:10)
    at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:78:26)Error: getaddrinfo ENOTFOUND localhost undefined:5554
    at errnoException (dns.js:27:10)
    at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:78:26)

2 - Both emulators (Android and iOS) when running displays nothing but a dark screen and cannot actually see what my app does.

Hi Perez,

Your specific error made me think you are probably using a http request in some part of your application. After through research I have found out that one reason for this error is node.js trying to handle invalid host and/or hostname.

As discussed here https://github.com/felixge/node-mysql/issues/1158 and here https://github.com/nodejs/node-v0.x-archive/issues/25751 on some versions and platforms
this error occurs even if the hostname is corrected after one invalid try.

I can not reproduce this error as it is too application specific but I can make the following suggestions : 

1.) If you are using MAC OS try to restart your DNS service.
2.) Update you Node.js version to the latest stable release.
3.) Start your emulator manually and then execute your tns run ios --emulator (or tns run android --emulator)
4.) If you your application is making too many http request lower their count.

If you are using Android platform from your preferred cmd / shell you can start the command monitor which
will start Android Device Monitor. With this application you can log additional debug information
when trying to run your mobile application on device or emulator.

I hope those suggestions will help you out - if you need further assistance do not hesitate to contact us at NativeScript Forum. If nothing of the suggested above does not resolve your issue - please provide additional information about your application code, NativeScript version and platform on which you are running

Regards,