How can I resolve 'npm ERR! code ELIFECYCLE' in Project.js during npm start

Question

I was following the getting started with create react native app to create my first react native application. But I am getting the following error -

npm start

2:11:42 PM: Starting packager... 

2:11:46 PM: Error starting packager:
Error: Couldn't start project. Please fix the errors and restart the
project.

at /xdl/src/Project.js:1039:11
at Generator.next (<anonymous>)
at step (/Users/xyz/my-app/node_modules/xdl/build/Project.js:1461:191)
at /Users/xyz/my-app/node_modules/xdl/build/Project.js:1461:361
at <anonymous> 
npm ERR! code ELIFECYCLE 
npm ERR! errno 1 
npm ERR! my-app@0.1.0 start: `react-native-scripts start` 
npm ERR! Exit status 1 
npm ERR! Failed at the my-app@0.1.0 start script.

The line of code this trace is referring to in the file Project.js -

function _asyncToGenerator(fn) { return function () { var gen = fn.apply(this, arguments); return new Promise(function (resolve, reject) { function step(key, arg) { try { var info = gen[key](arg); var value = info.value; } catch (error) { reject(error); return; } if (info.done) { resolve(value); } else { return Promise.resolve(value).then(function (value) { step("next", value); }, function (err) { step("throw", err); }); } } return step("next"); }); }; }

As suggested here npm ERR! code ELIFECYCLE I've tried to do a npm run clean and delete node_modules and npm install. But that didn't help either.

Version details -

➜ npm -v
 5.0.1

➜ node -v
v8.0.0

Answer 1

The React code should be fine.

Did you maybe move your project to another folder? Similar problem on github

Try the following:

• Remove your node_modules folder in your project root rm -rf node_modules
• Go to your project root and run npm install

Answer 2

I wouldn't claim to entirely understand the solution. I think it had something to do with either incorrect addresses recorded to navigate node_modules, or it may have been my version of watchman was outdated or corrupted.

I fixed the issue by reinstalling watchman and deleting/recreating the node_modules and package-lock.json files.

npm cache clean --force

rm -rf node_modules

rm -rf package-lock.json

brew uninstall watchman

npm r -g watchman

npm install watchman

yarn

npm install

react-native link

npm start

Some of the steps might be expendable but it took me a long time so I wanted it to be watertight.

Good luck.

Answer 3

Date - 12 June, 2017

Just an FYI one liner -

Seems like npm5 is not stable yet. As mentioned by @jit in the comments. The problem was resolved after reverting to npm 4.6.1

npm install -g npm@4.6.1

Answer 4

I tried all the above steps but the thing that work for me is to delete the "node_module" folder in home directory "C:\Users\musabarif\node_modules"

Make sure you have not installed something accidentally in your Home folder.

Answer 5

First of all check the Error in Red colored Text try to resolve that particular error and if any of above things didn't work then follow the following steps:

1. Create a .env file in your Project folder

2. Write SKIP_PREFLIGHT_CHECK=true in the file

3. Save the file

4. Try to run the project using npm start

Answer 6

I just changed the environment variable to c:\windows\system32 and it worked.

Steps to do so are:

1. Go to the control panel
2. Click on System
3. Choose Advanced System Settings
4. In the environment variables change the PATH to c:\windows\system32