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I'm getting the following error from Xcode: Couldn't compile connection: <IBCocoaTouchOutletConnection:0x401538380 <IBProxyObject: 0x40154a260> => categoryPicker => <IBUIPickerView: 0x4016de1e0>> I've narrowed this down to a single outlet connection in storyboard. My code (about 30 views with lots of other connections) compiles and runs fine until I add a connection from a UIPicker to the view's categoryPicker property. The picker itself also works fine, I just can't reload it without getting this connection to work: @interface FiltersTableViewController : UITableViewController <UIPickerViewDataSource, UIPickerViewDelegate> { NSFetchedResultsController *fetchedResultsController; FilterTableViewController *filterView; AppDelegate *appDelegate; NSManagedObjectContext *managedObjectContext; } @property (nonatomic, strong) FilterTableViewController *filterView; @property (nonatomic, strong) NSFetchedResultsController *fetchedResultsController; @property (nonatomic, strong) NSManagedObjectContext *managedObjectContext; @property (nonatomic, weak) IBOutlet UIPickerView *categoryPicker; - (void)configureCell:(FilterTableViewCell *)cell atIndexPath:(NSIndexPath *)indexPath; - (void)performFetch; @end The UIPickerView is in a UITableViewCell. Here's an image of the storyboard, the connection from "categoryPicker" to "FiltersTableViewController" causes the error: Thanks for any ideas, or suggestions on how to debug it! EDIT: I removed the connection and added one line to numberOfComponentsInPickerView: - (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView { categoryPicker = pickerView; return 1; } This now works!, but I'd like to understand why the connection won't work and what that e

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