Module not found: Can't resolve 'react'

I am currently facing this problem when I attempt to install any node package into an app created with create-react-app:

`npm WARN gentlyRm not removing /Users/user/Desktop/mobx-shopping/node_modules/espree/node_modules/.bin/acorn as it wasn’t installed by /Users/user/Desktop/mobx-shopping/node_modules/espree/node_modules/acorn npm notice created a lockfile as package-lock.json. You should commit this file.

npm WARN mobx-react@4.2.1 requires a peer of react@^0.13.0 || ^0.14.0 || ^15.0.0 || ^16.0.0-0 but none was installed.`

Then when I run the app with npm start and it compiles, I get the following error:

 Failed to compile.
 ./src/index.js
 Module not found: Can't resolve 'react' in '/Users/user/Desktop/mobx-shopping/src'

Node version: 8.0.0 NPM version: 5.0.3 React: 15.6.0

[gaearon]

Try removing package-lock.json, run npm install and then npm start again. Please also share your package.json file.

If it doesn’t help, install an older version of npm (e.g. 3.x). 5.x is still fairly buggy and might be causing this.

I’ll close because it is not an issue on our side. npm just failed to install the react module for some reason.

[maciej-gurban]

Removing package-lock.json and then running npm install helped me, thanks!