title: Always got that error under Yosemite: <Error>: ImageIO: CGImageSourceCreateWithData data parameter is nil
body: <p>Good morning team.
  I'm using a mkmapview under Yosemite and render custom tiles. But always got that error :
  : ImageIO: CGImageSourceCreateWithData data parameter is nil</p>
  
  <p>Although the tiles are drawn successfully.
  I searched a lot and tried everything I faced.</p>
  
  <ol>
  <li>Change map types.</li>
  <li>Change the flag: canReplaceMapContent.</li>
  <li>Change the project to non-ARC and retain all objects.</li>
  </ol>
  
  <p>I even get a code from <a href="https://github.com/viggiosoft/MapTileOverlayTutorial" rel="nofollow">github</a> &amp; it produces the same error
  Nothing succedded. Is that a bug in the system? If not how can I overcome it?</p>