title: Vuepress dev server is not working when only i tried it by yarn
body: <p>the Vuepress dev server is not working just when i tried it by yarn. That server give me massive errors. but when i tried same thing by npm, there was no problem. What's wrong with my yarn? or vuepress? or windows?</p>
  
  <p>my system information: </p>
  
  <ul>
  <li>Windows 10 64bit</li>
  <li>npm v6.13.4</li>
  <li>yarn v1.12.1</li>
  <li>vuepress v1.2.0</li>
  </ul>
  
  <p>below is my steps for trying to make yarn-vuepress dev server</p>
  
  <pre><code>$mkdir dir-name
  
  $cd dir-name
  
  $yarn init -y
  $yarn install
  $yarn add vuepress -D
  </code></pre>
  
  <p>====edit package.json file==== <br>
  add these:</p>
  
  <pre><code>"scripts":{
  "dev:docs":"vuepress dev docs"
  "build:docs":"vuepress build docs"
  } 
  </code></pre>
  
  <p>==============================</p>
  
  <p>make "\docs" folder and "README.md" file.</p>
  
  <p>==============================
  again at terminal,</p>
  
  <pre><code>$yarn dev:docs
  </code></pre>
  
  <p>.
  .
  .
  Client building...
  .
  .
  .</p>
  
  <p><code>&gt;VuePress dev server listening at http://localhost:8080/</code></p>
  
  <p>but in that page, always i see this on console:
  <a href="https://i.stack.imgur.com/jX5NK.png" rel="nofollow noreferrer">bug log</a></p>
  
  <p>What can i do for solving this problem?</p>