NPM run watch gives error

Hi, I am using Laravel Mix to process sass and js files. However, it now shows some error, which I couldn't understand.

Any ideas? Thanks.

 [9] → npm run watch

> @ watch /Users/Geet/Dropbox/Personal/projects/pushvertize
> npm run development -- --watch


> @ development /Users/Geet/Dropbox/Personal/projects/pushvertize
> cross-env NODE_ENV=development node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js "--watch"

module.js:549
    throw err;
    ^

Error: Cannot find module '..'
    at Function.Module._resolveFilename (module.js:547:15)
    at Function.Module._load (module.js:474:25)
    at Module.require (module.js:596:17)
    at require (internal/module.js:11:18)
    at Object.<anonymous> (/Users/Geet/Dropbox/Personal/projects/pushvertize/node_modules/.bin/cross-env:4:16)
    at Module._compile (module.js:652:30)
    at Object.Module._extensions..js (module.js:663:10)
    at Module.load (module.js:565:32)
    at tryModuleLoad (module.js:505:12)
    at Function.Module._load (module.js:497:3)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! @ development: `cross-env NODE_ENV=development node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js "--watch"`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the @ development 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/Geet/.npm/_logs/2018-09-13T14_11_56_534Z-debug.log
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! @ watch: `npm run development -- --watch`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the @ watch 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/Geet/.npm/_logs/2018-09-13T14_11_56_553Z-debug.log