npm run dev 报错

npm run dev报这个错 怎么办？

F:\mooc\vue-demo>npm run dev
> vue-demo@1.0.0 dev F:\mooc\vue-demo
> cross-env NODE_ENV=development webpack-dev-server --config webpack.config.js
F:\mooc\vue-demo\node_modules\_webpack-dev-server@3.1.9@webpack-dev-server\bin\webpack-dev-server.js:363
    throw err;
    ^
TypeError: Cannot match against 'undefined' or 'null'.
    at addHooks (F:\mooc\vue-demo\node_modules\_webpack-dev-server@3.1.9@webpack-dev-server\lib\Server.js:103:48)
    at new Server (F:\mooc\vue-demo\node_modules\_webpack-dev-server@3.1.9@webpack-dev-server\lib\Server.js:116:5)
    at startDevServer (F:\mooc\vue-demo\node_modules\_webpack-dev-server@3.1.9@webpack-dev-server\bin\webpack-dev-server.js:355:14)
    at processOptions (F:\mooc\vue-demo\node_modules\_webpack-dev-server@3.1.9@webpack-dev-server\bin\webpack-dev-server.js:309:5)
    at Object.<anonymous> (F:\mooc\vue-demo\node_modules\_webpack-dev-server@3.1.9@webpack-dev-server\bin\webpack-dev-server.js:424:1)
    at Module._compile (module.js:570:32)
    at Object.Module._extensions..js (module.js:579:10)
    at Module.load (module.js:487:32)
    at tryModuleLoad (module.js:446:12)
    at Function.Module._load (module.js:438:3)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! vue-demo@1.0.0 dev: `cross-env NODE_ENV=development webpack-dev-server --config webpack.config.js`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the vue-demo@1.0.0 dev 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\li\AppData\Roaming\npm-cache\_logs\2018-10-17T04_34_48_449Z-debug.log
F:\mooc\vue-demo>