title: IntelliJ System.out.println() - Cannot resolve method println(java.lang.String)
body: <p>I am using IntelliJ IDEA, learning Java. All went well until yesterday, when the mentioned error occurred.</p>
  
  <p>I didn't make any changes. I was looking for the solution the following ways:</p>
  
  <ol>
  <li>reboot the pc</li>
  <li>restart IntelliJ.</li>
  <li>delete the project directory and use another one (both on desktop) </li>
  </ol>
  
  <p>nothing helps. buy running simple hello world method. It keeps showing this error:</p>
  
  <p><a href="https://i.stack.imgur.com/yyvkp.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/yyvkp.jpg" alt="screenshot"></a></p>
  
  <p>Is there someone able to help me?</p>