cocoa - Attempt to insert nil -

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It seems that it should be easy to add bullion to an NSMutableArray.

Assume that toDoArray is intialized to have an NSMutableArray following: 

  BOOL checkboxState = NO; [ToDoArray addObject: checkBoxState];  
        
 
 
 
 NSMutable arrays require an id, the object is an odd part of C. An ID is an object, but there are no primitive (for example,   s preferences, while  NSArray  s are objects, and in extensions,  id  S). 
 
 Maybe it can help

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