CODEWITHSUNDEEP
reactjsnpmcreate-react-app
javazen
javazen

Reputation: 171

Why is npm start (after create-react-app) failing to run?

After I create a sample react app using create-react-app, npm start fails.

I have tried this using node 11.4 and 10.4 (npm 6.4.1)

npm install create-react-app -g
create-react-app t2
cd t2
npm start

Expected

To be able to start simple react server to hit in browser at localhost:3000

Actual

Server did not start, got this in my terminal:

$ npm start

> [email protected] start /Users/samr/dev/githubs/react/t2
> react-scripts start

/Users/samr/dev/githubs/react/t2/node_modules/ajv/lib/keyword.js:65
      throw new Error('custom keyword definition is invalid: '  + this.errorsText(validateDefinition.errors));
      ^

Error: custom keyword definition is invalid: data.errors should be boolean
    at Ajv.addKeyword (/Users/samr/dev/githubs/react/t2/node_modules/ajv/lib/keyword.js:65:13)
    at module.exports (/Users/samr/dev/githubs/react/t2/node_modules/ajv-errors/index.js:10:7)
    at Object.<anonymous> (/Users/samr/dev/githubs/react/t2/node_modules/schema-utils/src/validateOptions.js:22:1)
    at Module._compile (internal/modules/cjs/loader.js:723:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:734:10)
    at Module.load (internal/modules/cjs/loader.js:620:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:560:12)
    at Function.Module._load (internal/modules/cjs/loader.js:552:3)
    at Module.require (internal/modules/cjs/loader.js:659:17)
    at require (internal/modules/cjs/helpers.js:22:18)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! [email protected] start: `react-scripts start`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the [email protected] 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:
npm ERR!     /Users/samr/.npm/_logs/2019-02-09T23_19_40_848Z-debug.log

Upvotes: 16

Views: 21081

Answers (5)

taurus05
taurus05

Reputation: 2546

The accepted answer didn't work for me. Instead i did this:

  • deleted node_modules folder.

  • cd to project parent directory.

    npm install
    npm start

This worked like a charm.

Upvotes: 0

atsnam
atsnam

Reputation: 379

Quick fix is mentioned here :

Essentially go to node_modules/ajv/lib/keyword.js and comment out lines 64 and 65.

Upvotes: 9

nik.ss
nik.ss

Reputation: 81

just add resolutions to your package.json like this:

  { 
    "dependencies": {
      ...
    }
    "resolutions": {
      "ajv": "6.8.1"
    }
  }

then run npm install. if you use yarn, yarn install

Upvotes: 1

aquilesb
aquilesb

Reputation: 2272

As @atsnam has said, you can find the resolution here https://github.com/webpack/webpack/issues/8768.

If you use yarn

add below to package.json

"resolutions": {
  "ajv": "6.8.1"
}

then run yarn install

if you use npm

npm uninstall ajv
npm install [email protected]

That worked for me

Upvotes: 11

Varad
Varad

Reputation: 1022

As per the suggestion in Github answers the below change has enabled me to work.

To fix this error, just change:
Line 14: `errors: 'full',`
to:
Line 14: `errors: true`
in file **node_modules\ajv-errors\index.js**

Upvotes: 0

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