'React-native error requiring unknown module 'react'

When I run my react-native app with Xcode, and after the app starts to load, I see this error:

"Requiring unknown module "react". If you are sure the module is there, try restarting the packager."

My package.json contents are:

{
  "name": "the_golf_mentor",
  "version": "0.0.1",
  "private": true,
  "scripts": {
    "start": "node node_modules/react-native/local-cli/cli.js start"
  },
  "dependencies": {
    "react-native": "^0.21.0",
    "react-native-button": "^1.4.2",
    "react-native-cookies": "^0.0.5",
    "react-native-db-models": "^0.1.3",
    "react-native-navbar": "^1.2.1",
    "react-native-side-menu": "^0.18.0",
    "tcomb-form-native": "^0.3.3"
  }
}

I have tried restarting the package manager, and I have also removed the node_module folder and done a fresh npm install. How do I fix this problem?

Solution 1:^[1]

I had this after enabling hot reloading, and then downgrading my react version to support a library I was using.

Simulator > Reset Content and Settings

Got it running again.

Solution 2:^[2]

In React Native React lives in react-native module instead of react (for React JS). In that case import React and other React Native modules via:

import React, {
    Component,
    View,        
    Text,
    // other React Native modules
} from 'react-native';

Solution 3:^[3]

I encountered the same error. I closed down IDE and restarted, it worked for me. If nothing works out, try npm install

Solution 4:^[4]

You should require React from react-native in a react-native project, and not from react.

var React = require('react-native');

Solution 5:^[5]

I had similar issue: "Error: Requiring Unknown module 3" after installing '@react-navigation/native', so I did the following to fix it:

Close everything (Metro, Debugger and Simulator)
npm install
npx pod-install ios (On Mac)
npm run ios

and that's it!

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution	Source
Solution 1	Tom
Solution 2	neciu
Solution 3	Malith Senanayake
Solution 4	Moti Azu
Solution 5	A.Z

'React-native error requiring unknown module 'react'

Solution 1:[1]

Solution 2:[2]

Solution 3:[3]

Solution 4:[4]

Solution 5:[5]