title: Error when using MKMapView
body: <p>I created a single view application with story boards. All I had in my view was MKMapView, thats it. It compiles without errors or warning but when I run it, I get this error in my console window:</p>
  
  <pre><code>&lt;Error&gt;: ImageIO: CGImageReadSessionGetCachedImageBlockData ***   CGImageReadSessionGetCachedImageBlockData: readSession [0x8ab5750] has bad readRef [0x14b79c70]
  </code></pre>
  
  <p>I'm using Xcode 4.3 and iPhone Simulator 5.1. Any thoughts?  </p>
  
  <p>.h File  </p>
  
  <pre><code>#import UIKit/UIKit.h
  #import CoreLocation/CoreLocation.h
  #import MapKit/MapKit.h
  
  @interface WhereamiViewController : UIViewController &lt;CLLocationManagerDelegate, MKMapViewDelegate&gt;
  { 
  IBOutlet MKMapView *worldView;
  IBOutlet UIActivityIndicatorView *activityIndicator;
  IBOutlet UITextField *locationTitleField;
  }
  
  @end
  </code></pre>
  
  <p>.m file</p>
  
  <pre><code>#import "WhereamiViewController.h"
  
  @interface WhereamiViewController ()
  
  @end
  
  @implementation WhereamiViewController
  
  - (void)viewDidLoad
  {
  [super viewDidLoad];
  // Do any additional setup after loading the view, typically from a nib.
  }
  
  - (void)didReceiveMemoryWarning
  {
  [super didReceiveMemoryWarning];
  // Dispose of any resources that can be recreated.
  }
  
  @end
  </code></pre>
  
  <p><img src="https://i.stack.imgur.com/ql3Kv.png" alt="enter image description here"></p>