React Native - Cannot find entry file index.android in any of the roots.

I was developing an Android app using React Native. I was trying to use an emulator to run an application using an Android device, and then trying to run it again as an emulator.
Previously, when using Windows, I solved the problem by using "adb reverse tcp:8081 tcp:8081" method, but this method was not solved in the process of developing with mac today. Please help me somebody.

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[AdrianMrn]

Make sure your version of React Native on your Mac is up to date. What do you get when you type react-native -v in your terminal?

Also see: #14246

[hannigand]

Getting the same problem on iOS. I haven't tried Android yet.

react-native: 0.53.0

Running npm start -- --reset-cache and then react-native run-ios does not fix the problem.

Frustratingly I have to create an index.ios.js and index.android.js and duplicate the contents of index.js until a fix is identified.

[AdrianMrn]

In that case, I'm at a loss.

When you're running react-native run-ios[/android], it's looking for an index.ios[/android].js file, which doesn't exist past react-native 0.51 (or earlier, idk). That's why I thought you were running an older version.

I'm sure this is a recurring issue and somebody else will be able to answer your question, sorry I couldn't be of more help.

[hannigand]

No worries @AdrianMrn, all discussion is welcome. It's very bizarre that it has been working in the past but I've only got this problem this morning.

@AdrianMrn
my react-native version is
react-native-cli: 2.0.1
react-native: 0.53.3

[AdrianMrn]

@kojongick @hannigand if you still haven't fixed this, a temporary workaround could be to create 2 files called index.android.js and index.ios.js, and copy+pasting what you have in index.js into these files.

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[alexxsanchezm]

I know this issue is closed, but to anyother else out must know this happened after a react native upgrade. I'm currently using:

RN: 0.56
RN-CLI: 2.0.1

My guess the server is running with a different version and looking for index.[android/ios].js file. Although if I create a new project, It runs as expected.

[abn0rmal-d0ct0r]

React Native Cli --> 2.0.1
React Native --> 0.57.2

And I still get the same error. Looks like the only to get out is to create index.android/ios.js file and duplicate the files.