htmlWebpackPlugin插件未安装

Error: Cannot find module 'htmlWebpackPlugin'

    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:582:15)

    at Function.Module._load (internal/modules/cjs/loader.js:508:25)

    at Module.require (internal/modules/cjs/loader.js:637:17)

    at require (D:\nodejs\node_global\node_modules\webpack-cli\node_modules\_v8-compile-cache@2.0.2@v8-compile-cache\v8-compile-cache.js:159:20)

    at Object.<anonymous> (D:\workspace\webpack-demo1\webpack.config.js:1:89)

    at Module._compile (D:\nodejs\node_global\node_modules\webpack-cli\node_modules\_v8-compile-cache@2.0.2@v8-compile-cache\v8-compile-cache.js:178:30)

    at Object.Module._extensions..js (internal/modules/cjs/loader.js:712:10)

    at Module.load (internal/modules/cjs/loader.js:600:32)

    at tryModuleLoad (internal/modules/cjs/loader.js:539:12)

    at Function.Module._load (internal/modules/cjs/loader.js:531:3)

    at Module.require (internal/modules/cjs/loader.js:637:17)

    at require (D:\nodejs\node_global\node_modules\webpack-cli\node_modules\_v8-compile-cache@2.0.2@v8-compile-cache\v8-compile-cache.js:159:20)

    at WEBPACK_OPTIONS (D:\nodejs\node_global\node_modules\webpack-cli\bin\convert-argv.js:115:13)

    at requireConfig (D:\nodejs\node_global\node_modules\webpack-cli\bin\convert-argv.js:117:6)

    at D:\nodejs\node_global\node_modules\webpack-cli\bin\convert-argv.js:124:17

    at Array.forEach (<anonymous>)

    at module.exports (D:\nodejs\node_global\node_modules\webpack-cli\bin\convert-argv.js:122:15)

    at yargs.parse (D:\nodejs\node_global\node_modules\webpack-cli\bin\cli.js:228:39)

    at Object.parse (D:\nodejs\node_global\node_modules\webpack-cli\node_modules\_yargs@12.0.5@yargs\yargs.js:567:18)

    at D:\nodejs\node_global\node_modules\webpack-cli\bin\cli.js:206:8

    at Object.<anonymous> (D:\nodejs\node_global\node_modules\webpack-cli\bin\cli.js:505:3)

    at Module._compile (internal/modules/cjs/loader.js:701:30)

    at Object.Module._extensions..js (internal/modules/cjs/loader.js:712:10)

    at Module.load (internal/modules/cjs/loader.js:600:32)

    at tryModuleLoad (internal/modules/cjs/loader.js:539:12)

    at Function.Module._load (internal/modules/cjs/loader.js:531:3)

    at Module.require (internal/modules/cjs/loader.js:637:17)

    at require (internal/modules/cjs/helpers.js:22:18)

    at Object.<anonymous> (D:\nodejs\node_global\node_modules\webpack\bin\webpack.js:156:2)

    at Module._compile (internal/modules/cjs/loader.js:701:30)

第一次跟着敲没问题，有一次不小心把node_modules文件夹删除了我就重新搭项目，但是却一直出现这样的错误，插件是github上的安装指令，提示也是正常的，按理来说安装没问题啊。