Laravel 5.4 ‘cross-env’ Is Not Recognized as an Internal or External Command

Question

I\'m trying to run npm run dev for Laravel Mix and I get this error:

> @ dev D:\\projects\\ptcs
> cross-env NODE_ENV=development webpack -         


        

Answer 1

Simply try running npm install / yarn etc first before running npm start / yarn start as @only4 mentioned, if you see this problem, as it means your .env is not in sync with your package.json, i.e. you installed a package but not quite configured it or other way around