npm run dev error

 "C:\\Program Files\\nodejs\\node.exe" "C:\\Users\\Administrator\\AppData\\Roaming\\npm\\node_modules\\npm\\bin\\npm-cli.js" "run" "dev"
npm ERR! node v6.7.0
npm ERR! npm  v4.1.2
npm ERR! code ELIFECYCLE
npm ERR! douyu@1.0.0 dev: `node build/dev-server.js`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the douyu@1.0.0 dev script 'node build/dev-server.js'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the douyu package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     node build/dev-server.js
npm ERR! You can get information on how to open an issue for this project with:
npm ERR!     npm bugs douyu
npm ERR! Or if that isn't available, you can get their info via:
npm ERR!     npm owner ls douyu
npm ERR! There is likely additional logging output above.

when i input npm run dev,these errors appear. But my npm and node’s version are satisfy condition. npm-4.1.2 node-6.7.0. why the server.js cant run

[nomantufail]

npm install webpack-dev-server@2.9.7 --save-dev

run this command in your project directory. i hope this might help.

[newsapkota]

npm install --save-dev cross-env

Thanks, this save my day, it’s works.