What causes -[__NSArrayM removeAllItems]: unrecognized selector while using Kal?

Question

I have been working with Kal for 3 weeks. I was able to modify the holiday example to use my data and drill down. I am trying to create the simplest working process to build on.

I can display the calendar but when I try to mark dates I get an exception error:

On first starting this process I had a error about the delegate I read that I needed to change from this

 */
 @interface KalViewController : UIViewController <KalViewDelegate, KalDataSourceCallbacks>
 {
   KalLogic *logic;
   UITableView *tableView;
   id <UITableViewDelegate> delegate;
   id <KalDataSource> dataSource;
   NSDate *initialDate;                    // The date that the calendar was initialized with *or* the currently selected date when the view hierarchy was torn down in order to satisfy a low memory warning.
   NSDate *selectedDate;                   // I cache the selected date because when we respond to a memory warning, we cannot rely on the view hierarchy still being alive, and thus we cannot always derive the selected date from KalView's selectedDate property.
  }

   @property (nonatomic, assign) id<UITableViewDelegate> delegate;
   @property (nonatomic, assign) id<KalDataSource> dataSource;
   @property (nonatomic, retain, readonly) NSDate *selectedDate;

TO THIS

 @interface KalViewController : UIViewController <KalViewDelegate, KalDataSourceCallbacks>
 {
 KalLogic *logic;
  UITableView *tableView;
 __weak id <UITableViewDelegate> delegate;
 __weak id <KalDataSource> dataSource;
NSDate *initialDate;                    // The date that the calendar was initialized with *or* the currently selected date when the view hierarchy was torn down in order to satisfy a low memory warning.
 NSDate *selectedDate;                   // I cache the selected date because when we respond to a memory warning, we cannot rely on the view hierarchy still being alive, and thus we cannot always derive the selected date from KalView's selectedDate property.

}

 //@property (nonatomic, assign) id<UITableViewDelegate> delegate;
 //@property (nonatomic, weak) id <UITableViewDelegate> delegate;
 //@property (nonatomic, weak) id <KalDataSource> dataSource;
 @property ( weak) id <UITableViewDelegate> delegate;
 @property ( weak) id <KalDataSource> dataSource;
 @property (nonatomic, retain, readonly) NSDate *selectedDate;

Is this Correct Incorrect way of getting out of the delegate error?