title: Android gives error "Cannot fit requested classes in a single dex file"
body: <p>I don't know why but it's impossible to launch my app on my mobile this morning. I get this error message:</p>
  <blockquote>
  <p>Cannot fit requested classes in a single dex file. Try supplying a
  main-dex list.</p>
  <p># methods: 68061 &gt; 65536 Message{kind=ERROR, text=Cannot fit requested classes in a single dex file. Try supplying a main-dex list.</p>
  <p># methods: 68061 &gt; 65536, sources=[Unknown source file], tool</p>
  </blockquote>
  <p>I'm really new to Android and I don't understand the problem and what I need to do? And why I get this problem now and not before?</p>