Html Webpack Plugin:
<pre>
  StyleExtHtmlWebpackPluginError: StyleExtHtmlWebpackPlugin: could not find ExtractTextWebpackPlugin'  s generated .css file; available files: 'app.a8a27af25d99f2f71307.js,vendor.a8a27af25d99f2f71307.js  ,icon/apple-touch-icon-120x120.png,icon/apple-touch-icon-114x114.png,favicon.ico,icon/apple-touch-i  con-144x144.png,icon/apple-touch-icon-57x57.png,icon/apple-touch-icon-152x152.png,icon/apple-touch-  icon-72x72.png,icon/apple-touch-icon-60x60.png,icon/apple-touch-icon-76x76.png,icon/favicon-16x16.p  ng,icon/favicon-128.png,icon/favicon-196x196.png,icon/favicon-32x32.png,icon/favicon-96x96.png,icon  /favicon.ico,icon/mstile-144x144.png,icon/mstile-150x150.png,icon/mstile-310x150.png,icon/mstile-70  x70.png,images/hill.sketch,images/hill.svg,manifest.json,icon/mstile-310x310.png'
  
  - common.js:8 error
    [sattuma.fi]/[style-ext-html-webpack-plugin]/lib/common.js:8:15
  
  - findFile.js:36 findGeneratedCssFile
    [sattuma.fi]/[style-ext-html-webpack-plugin]/lib/findFile.js:36:3
  
  - findFile.js:49 findCssFile
    [sattuma.fi]/[style-ext-html-webpack-plugin]/lib/findFile.js:49:12
  
  - plugin.js:43 wirePluginEvent
    [sattuma.fi]/[style-ext-html-webpack-plugin]/lib/plugin.js:43:25
  
  - plugin.js:16 Compilation.compilation.plugin
    [sattuma.fi]/[style-ext-html-webpack-plugin]/lib/plugin.js:16:7
  
  - Tapable.js:172 Compilation.applyPluginsAsyncWaterfall
    [sattuma.fi]/[tapable]/lib/Tapable.js:172:13
  
  - util.js:16 Compilation.tryCatcher
    [sattuma.fi]/[html-webpack-plugin]/[bluebird]/js/release/util.js:16:23
  
  
  - index.js:642 
    [sattuma.fi]/[html-webpack-plugin]/index.js:642:12
  
  - index.js:142 
    [sattuma.fi]/[html-webpack-plugin]/index.js:142:16
  
  - util.js:16 tryCatcher
    [sattuma.fi]/[html-webpack-plugin]/[bluebird]/js/release/util.js:16:23
  
  - promise.js:510 Promise._settlePromiseFromHandler
    [sattuma.fi]/[html-webpack-plugin]/[bluebird]/js/release/promise.js:510:31
  
  - promise.js:567 Promise._settlePromise
    [sattuma.fi]/[html-webpack-plugin]/[bluebird]/js/release/promise.js:567:18
  
  - promise.js:612 Promise._settlePromise0
    [sattuma.fi]/[html-webpack-plugin]/[bluebird]/js/release/promise.js:612:10
  
  - promise.js:691 Promise._settlePromises
    [sattuma.fi]/[html-webpack-plugin]/[bluebird]/js/release/promise.js:691:18
  
  - async.js:133 Async._drainQueue
    [sattuma.fi]/[html-webpack-plugin]/[bluebird]/js/release/async.js:133:16
  
  - async.js:143 Async._drainQueues
    [sattuma.fi]/[html-webpack-plugin]/[bluebird]/js/release/async.js:143:10
  
  - async.js:17 Immediate.Async.drainQueues
    [sattuma.fi]/[html-webpack-plugin]/[bluebird]/js/release/async.js:17:14
  
</pre>