title: Why do I get error "Lamba expressions are not supported in -source 1.6"?
body: <p>I'm using IntelliJ Idea and I get this error.</p>
  
  <blockquote>
    <p>Lamba expressions are not supported in -source 1.6</p>
  </blockquote>
  
  <p>Got this when I updated from 2016 to the 2017 version of the community edition after I did something with gradle.</p>
  
  <p>Settings: Java compiler: Project bytecode version: 1.8
  Modules bytecode version: 1.8
  Project SDK: 1.8
  Project language level: default(8)
  Modules 1.8 as well</p>