Not able to bundle application using react-native start

I was getting one error :

Unable to load script.Make sure you are either running a Metro server or that your bundle 'index.android.bundle' is packaged correctly for release

So I have fired this command :

react-native bundle --platform android --dev false --entry-file index.js --bundle-output android/app/src/main/assets/index.android.bundle --assets-dest android/app/src/main/res

So that error gone, but Now problem is I am not able to debugging. If I am using react-native start command then also in not bundling.

So main problem is I am not able to bundle application.

Please guide on this point.

Thanks.