[5.5] npm run watch error

permisi mastah ane lagi coba buat aplikasi chat laravel vue tapi ane ada masalah pas ngejalanin perintah NPM RUN WATCH, pas ane ketik perintah tersebut muncul error kaya gini..

 > @ watch C:\xampp\htdocs\laravel-chat-app-vue\chat-vue
> cross-env NODE_ENV=development node_modules/webpack/bin/webpack.js --watch --progress --hide-modules --
config=node_modules/laravel-mix/setup/webpack.config.js

The system cannot find the path specified.
events.js:163
throw er; // Unhandled 'error' event
      ^

Error: spawn node_modules\webpack\bin\webpack.js ENOENT
    at notFoundError (C:\Users\nanun\AppData\Roaming\npm\node_modules\cross-env\node_modules\cross-spawn\
lib\enoent.js:11:11)
    at verifyENOENT (C:\Users\nanun\AppData\Roaming\npm\node_modules\cross-env\node_modules\cross-spawn\l
at verifyENOENT (C:\Users\nanun\AppData\Roaming\npm\node_modules\cross-env\node_modules\cross-spawn\l
ib\enoent.js:46:16)
    at ChildProcess.cp.emit (C:\Users\nanun\AppData\Roaming\npm\node_modules\cross-env\node_modules\cross
-spawn\lib\enoent.js:33:19)
    at Process.ChildProcess._handle.onexit (internal/child_process.js:215:12)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! @ watch: `cross-env NODE_ENV=development node_modules/webpack/bin/webpack.js --watch --progress
--hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js`
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!     C:\Users\nanun\AppData\Roaming\npm-cache\_logs\2017-10-18T17_05_06_364Z-debug.log

package.json nya

 {
  "private": true,
  "scripts": {
    "dev": "npm run development",
    "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": "cross-env NODE_ENV=development node_modules/webpack/bin/webpack.js --watch --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js",
    "watch-poll": "npm run watch -- --watch-poll",
    "hot": "cross-env NODE_ENV=development node_modules/webpack-dev-server/.bin/webpack-dev-server.js --inline --hot --config=node_modules/laravel-mix/setup/webpack.config.js",
    "prod": "npm run production",
    "production": "cross-env NODE_ENV=production node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js"
  },
  "devDependencies": {
    "axios": "^0.16.2",
    "bootstrap-sass": "^3.3.7",
    "cross-env": "^5.0.1",
    "jquery": "^3.1.1",
    "laravel-mix": "^1.5.1",
    "lodash": "^4.17.4",
    "vue": "^2.1.10"
  },
  "dependencies": {
    "laravel-echo": "^1.3.2",
    "pusher-js": "^4.2.1"
  }
}

mastah ada yang ngalamin kaya gini, kalo ada bisa di share solusinya ?

ane agak kesulitan baca errornya..

terima kasih.