undefined is not an object (evaluating 'regeneratorRuntime.mark')

Is this a bug report?

Yes (write your answer here)

Have you read the Bugs section of the Contributing to React Native Guide?

(Write your answer here.)

Environment

1. react-native -v: 0.45.1
2. node -v: 8.1.3
3. npm -v: 5.0.4
4. yarn --version (if you use Yarn): 0.27.5

Then, specify:

1. Target Platform (e.g. iOS, Android): Android
2. Development Operating System (e.g. macOS Sierra, Windows 10): macOS Sierra 10.12.5
3. Build tools (Xcode or Android Studio version, iOS or Android SDK version, if relevant): Android SDK 25, Android Build Tools 25.0.2

Steps to Reproduce

(Write your steps here:)

1. react-native init AwesomeProject
2. react-native run-android

Expected Behavior

Should work as it did with RN v0.44.0 or RN 0.45.0 (Write what you thought would happen.)

Actual Behavior

undefined is not an object (evaluating 'regeneratorRuntime.mark')
<unknown>
    
loadModuleImplementation
    require.js:174:12
guardedLoadModule
    require.js:126:36
_require
    require.js:110:24
<unknown>
    index.js:2
loadModuleImplementation
    require.js:174:12
guardedLoadModule
    require.js:126:36
_require
    require.js:110:24
<unknown>
    configureStore.js:19
loadModuleImplementation
    require.js:174:12
guardedLoadModule
    require.js:126:36
_require
    require.js:110:24
<unknown>
    index.js:32
loadModuleImplementation
    require.js:174:12
guardedLoadModule
    require.js:126:36
_require
    require.js:110:24
<unknown>
    index.android.js:10
loadModuleImplementation
    require.js:174:12
guardedLoadModule
    require.js:119:45
_require
    require.js:110:24
global code
   

(Write what happened. Add screenshots!)

Reproducible Demo

(Paste the link to an example project and exact instructions to reproduce the issue.)

[ernoaapa]

Found the problem what I had (with new project generated with Ignite).

The error were pointing in my project to line import rootSaga from '../Sagas/' which contain export like this:

export default function * root () {
  yield [
    // ... snip ....
  ]
}

After changing it to this started to work:

const root = function * root () {
  yield [
    // .... snip ....
  ]
}
export default root

I’m not yet familiar with the ES6 generator functions and require support for them, but at least now I can continue. And have to say that the error were pointing to the place where the invalid export were. I hope this helps someone.

[Amurmurmur]

@vongohren Double make sure you reset the packager, Im using react-native 0.46.1 and babel at 2.0.0 all good on both platforms Debug/Release builds. Please make sure you run

watchman watch-del-all
rm -rf ./node_modules
rm -rf $TMPDIR/react-*
npm i babel-preset-react-native@2.0.0 -D -S
npm install
npm start -- --reset-cache
react-native run-ios

Also make sure you reset your android/ios emulator/simulator, delete both android/ios build folders.