title: Yarn requires Node.js 4.0 or higher and not executing scripts
body: <p>I want to start the server, but when I enter the command <strong>yarn run dev</strong> gives
  Yarn requires Node.js 4.0 or higher to be installed.
  I installed the latest available version of NodeJs, but nothing has changed. I also entered the command
  <strong>npm install -g yarn</strong>, but nothing worked either. How else can you solve this problem?</p>