为什么我的React Native应用程序无法在我的设备上运行

Question

I want to be able to test my app on Expo (an IPhone app used to test React Native code after you hit save) and I just can't seem to get past this error I'm getting Terminal . I've ran my app using Expo before with no problems but now after trying to include a Navigator in my app, I get an error.

First I did this:

$ npm i -g create-react-native-app
$ create-react-native-app my-project
$ cd my-project`

Then I wanted to include a Navigator in my app so I went ahead and did this:

npm install --save react-navigation

After that, in order to get Expo running I did:

npm start

When I do npm start , I get this error in Terminal :

npm ERR! file sh
npm ERR! code ELIFECYCLE
npm ERR! errno ENOENT
npm ERR! syscall spawn
npm ERR! Mestro@0.1.0 start: `react-native-scripts start`
npm ERR! spawn ENOENT
npm ERR! 
npm ERR! Failed at the Mestro@0.1.0 start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:

Answer 1

my guess would be that you are using npm5, I would recommend using npm4, npm5 is currently (as of june 17, 2017) very buggy. see this recommendation in the README .