Html Webpack Plugin: 
  Error: Child compilation failed:
  Entry module not found: Error: Can't resolve 'D:\phpStudy\WWW\webpackdemo\workbench\templates\how-to-works.html' in 'D:\phpStudy\WWW\webpa  ckdemo':
  Error: Can't resolve 'D:\phpStudy\WWW\webpackdemo\workbench\templates\how-to-works.html' in 'D:\phpStudy\WWW\webpackdemo'
  
  - compiler.js:79 childCompiler.runAsChild
    [webpackdemo]/[html-webpack-plugin]/lib/compiler.js:79:16
  
  - Compiler.js:240 compile
    [webpackdemo]/[webpack]/lib/Compiler.js:240:11
  
  - Compiler.js:485 hooks.afterCompile.callAsync.err
    [webpackdemo]/[webpack]/lib/Compiler.js:485:14
  
  
  - Hook.js:35 AsyncSeriesHook.lazyCompileHook [as _callAsync]
    [webpackdemo]/[tapable]/lib/Hook.js:35:21
  
  - Compiler.js:482 compilation.seal.err
    [webpackdemo]/[webpack]/lib/Compiler.js:482:30
  
  
  - Hook.js:35 AsyncSeriesHook.lazyCompileHook [as _callAsync]
    [webpackdemo]/[tapable]/lib/Hook.js:35:21
  
  - Compilation.js:964 hooks.optimizeAssets.callAsync.err
    [webpackdemo]/[webpack]/lib/Compilation.js:964:35
  
  
  - Hook.js:35 AsyncSeriesHook.lazyCompileHook [as _callAsync]
    [webpackdemo]/[tapable]/lib/Hook.js:35:21
  
  - Compilation.js:955 hooks.optimizeChunkAssets.callAsync.err
    [webpackdemo]/[webpack]/lib/Compilation.js:955:32
  
  
  - Hook.js:35 AsyncSeriesHook.lazyCompileHook [as _callAsync]
    [webpackdemo]/[tapable]/lib/Hook.js:35:21
  
  - Compilation.js:950 hooks.additionalAssets.callAsync.err
    [webpackdemo]/[webpack]/lib/Compilation.js:950:36
  
  
  - Hook.js:35 AsyncSeriesHook.lazyCompileHook [as _callAsync]
    [webpackdemo]/[tapable]/lib/Hook.js:35:21
  
  - Compilation.js:946 hooks.optimizeTree.callAsync.err
    [webpackdemo]/[webpack]/lib/Compilation.js:946:32
  
  
  - Hook.js:35 AsyncSeriesHook.lazyCompileHook [as _callAsync]
    [webpackdemo]/[tapable]/lib/Hook.js:35:21
  
  - Compilation.js:888 Compilation.seal
    [webpackdemo]/[webpack]/lib/Compilation.js:888:27
  
  - Compiler.js:479 hooks.make.callAsync.err
    [webpackdemo]/[webpack]/lib/Compiler.js:479:17
  
  
  - Compilation.js:756 _addModuleChain
    [webpackdemo]/[webpack]/lib/Compilation.js:756:12
  
  - Compilation.js:635 errorAndCallback.bail.err
    [webpackdemo]/[webpack]/lib/Compilation.js:635:6
  
  - Compilation.js:668 moduleFactory.create
    [webpackdemo]/[webpack]/lib/Compilation.js:668:14
  
  - NormalModuleFactory.js:360 factory
    [webpackdemo]/[webpack]/lib/NormalModuleFactory.js:360:22
  
  - NormalModuleFactory.js:120 resolver
    [webpackdemo]/[webpack]/lib/NormalModuleFactory.js:120:21
  
  - NormalModuleFactory.js:200 asyncLib.parallel
    [webpackdemo]/[webpack]/lib/NormalModuleFactory.js:200:22
  
  - async.js:2772 
    [webpackdemo]/[neo-async]/async.js:2772:7