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

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Category:Languages

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 Salvatores-iMac:t2 samr$ npm start

t2@0.1.0 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. (/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! t2@0.1.0 start: react-scripts start npm ERR! Exit status 1 npm ERR! npm ERR! Failed at the t2@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: npm ERR! /Users/samr/.npm/_logs/2019-02-09T23_19_40_848Z-debug.log

 


Quick fix is mentioned here https://github.com/webpack/webpack/issues/8768

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

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