title: AttributeError: 'MainRouter' object has no attribute '_disabled_count'
body: <p>I am creating a kivy app where I have used router showing this error-</p>
  
  <p>AttributeError: 'MainRouter' object has no attribute '_disabled_count'</p>
  
  <p><img src="https://i.stack.imgur.com/HuJl5.png" alt=""></p>
  
  <p>Any solution? </p>