internal/modules/cjs/loader.js:573

    throw err;

    ^

Error: Cannot find module 'webpack/schemas/WebpackOptions.json'

    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:571:15)

    at Function.Module._load (internal/modules/cjs/loader.js:497:25)

    at Module.require (internal/modules/cjs/loader.js:626:17)

    at require (internal/modules/cjs/helpers.js:20:18)

    at Object.<anonymous> (/Users/sunyangyang/learning/webpack_/logs/webpack3.x/devserver/node_modules/webpack-cli/bin/config-yargs.js:1:85)

    at Module._compile (internal/modules/cjs/loader.js:678:30)

    at Object.Module._extensions..js (internal/modules/cjs/loader.js:689:10)

    at Module.load (internal/modules/cjs/loader.js:589:32)

    at tryModuleLoad (internal/modules/cjs/loader.js:528:12)

    at Function.Module._load (internal/modules/cjs/loader.js:520:3)

npm ERR! code ELIFECYCLE

npm ERR! errno 1

npm ERR! file_handles@1.0.0 server: `webpack-dev-server --open`

npm ERR! Exit status 1

npm ERR! 

npm ERR! Failed at the file_handles@1.0.0 server 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/sunyangyang/.npm/_logs/2018-06-01T11_10_09_113Z-debug.log