title: Error: yarn start - error Command "start" not found
body: <p>I am trying to learn React and I am using a private repo to start with it.</p>
  
  <p>I run <code>yarn start</code> in the directory of the repo but I get the error message:</p>
  
  <pre><code>yarn run v1.13.0
  error Command "start" not found.
  info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
  </code></pre>
  
  <p>I have both node and yarn installed.</p>
  
  <p>For node:</p>
  
  <pre><code>v10.15.0
  node is /usr/local/bin/node
  </code></pre>
  
  <p>For yarn:</p>
  
  <pre><code>1.13.0
  yarn is /usr/local/bin/yarn
  </code></pre>
  
  <p>I tried to reinstall both node and yarn but I get the same error message. moreover I tried to remove the yarn chance via <code>yarn cache clean</code> but nothing seems to work.</p>
  
  <p>The <code>package.json</code> contains the following:</p>
  
  <pre><code>{
    "name": "02-Manipulating-Strings",
    "version": "1.0.0",
    "author": "ssaunier",
    "license": "UNLICENSED",
    "private": true,
    "devDependencies": {
      "eslint": "^4.7.2",
      "eslint-config-airbnb-base": "^12.0.0",
      "eslint-plugin-import": "^2.7.0",
      "jest": "^21.1.0"
    },
    "scripts": {
      "test": "(eslint lib || true) &amp;&amp; jest"
    }
  }
  </code></pre>
  
  <p>The directory is organised in the following way:</p>
  
  <p><a href="https://i.stack.imgur.com/lIyVH.png" rel="noreferrer"><img src="https://i.stack.imgur.com/lIyVH.png" alt="project directory"></a></p>