Question: I'm new in react-native.
I have run react native project on Ubuntu by using 'react-native run-android' command. And I got the error on emulator 
"Unable to load script from assets 'index.android.bundle'.Make sure your bundle is packaged correctly or you are running a package server."

Answer: 
I also got this and I resolved this using following commands in your project directory:

```
$ mkdir android/app/src/main/assets

```

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

```
$ react-native run-android

```
For Windows user only:

1. Copy the path of adb location and set into `PATH` in your system variable,
2. Open project structure and delete node module folder.
3. Edit your project `package.JSON` file
change react-native version `"react-native": "0.55.2"`, and
babel `"babel-preset-react-native": "4"`, after that run `npm install`
4. Restart cmd and js server and run your react native project by `react-native run-android`