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Removing annotations from my map view in the following way: if ([[self.mapView annotations] count] > 0) { [self.mapView removeAnnotations:[self.mapView annotations]]; } causes my application to crash with the following exception: *** Terminating app due to uncaught exception 'NSRangeException', reason: 'Cannot remove an observer <MKAnnotationContainerView 0xe87b420> for the key path "title" from <PFAnnotation 0x10851230> because it is not registered as an observer.' The annotations are added in the following way: CLLocationCoordinate2D pinPosition; for (int index = 0; index < [array count]; index++) { Station *aStation = [array objectAtIndex:index]; PFAnnotation *stationPin = [[PFAnnotation alloc] init]; //StationPinView pinPosition = CLLocationCoordinate2DMake([[aStation valueForKey:@"latitude"] doubleValue], [[aStation valueForKey:@"longitude"] doubleValue]); stationPin.stationName = [aStation valueForKey:@"stationName"]; stationPin.stationPosition = pinPosition; stationPin.stationLength = [aStation valueForKey:@"platformLength"]; [self.mapView addAnnotation:stationPin]; [stationPin release]; } My PFAnnotation.h is: @interface PFAnnotation : NSObject <MKAnnotation> { NSString *stationName; CLLocationCoordinate2D stationPosition; NSNumber *stationLength; } @property (nonatomic, retain) NSString *stationName; @property CLLocationCoordinate2D stationPosition; @property (nonatomic, retain) NSNumber *stationLength; @end and my PFAnnotation.m is: @implementation PFAnnotation @synthesize stationName; @synthesize stationPosition; @synthesize stationLength; - (CLLocationCoordinate2D)coordinate; { return stationPosition; } - (NSString *)title { return stationName; } - (NSString *)subtitle { if (stationLength

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