title: Cannot assign value of type 'pantalla9' to type 'UIPageViewControllerDataSource?'
body: <p>I am trying to create a page view in the view controller.</p>
  
  <p>I am unable to assign value of type 'pantalla9' to type 'UIPageViewControllerDataSource?'</p>
  
  <p>Here is the Error message:</p>
  
  <p><a href="https://i.stack.imgur.com/eLDg5.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/eLDg5.png" alt="enter image description here"></a></p>
  
  <p>Here is the next error:</p>
  
  <p><a href="https://i.stack.imgur.com/y7HId.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/y7HId.png" alt="enter image description here"></a></p>