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I have an error where it crash the application when it is starting up. This is the error that i got: *** Terminating app due to uncaught exception 'CALayerInvalidGeometry', reason: 'CALayer position contains NaN: [nan nan]' *** First throw call stack: (0x250b022 0x2709cd6 0x24b3a48 0x24b39b9 0x217ec0d 0x2174f55 0x158f3f7 0xbc74e 0xbe512 0xbfa26 0xbe4ad 0x224ffda 0x224f956 0x224e449 0x224ab9a 0x24df970 0x247f1c1 0x2442967 0x2441d84 0x2441c9b 0x2c0a7d8 0x2c0a88a 0x1559626 0x2aed 0x2a65) terminate called throwing an exception i tried using Exception breakpoint and it doesn't show which part of the code has gone wrong.It only stop at this point -0xbc74e: movl $0, %eax- How can i solve it? Please help. *edit I found the part which throws the exception but i can't see what is wrong - (void)viewDidLoad { [super viewDidLoad]; [self.activityView startAnimating]; self.mapView.layerDelegate = self; self.mapView.touchDelegate = self; self.mapView.calloutDelegate = self; NSURL *mapUrl = [NSURL URLWithString:kTiledMapServiceURL]; AGSTiledMapServiceLayer *tiledLyr = [AGSTiledMapServiceLayer tiledMapServiceLayerWithURL:mapUrl]; [self.mapView addMapLayer:tiledLyr withName:@"Tiled Layer"]; . . . } - (void)mapViewDidLoad:(AGSMapView *)mapView { AGSEnvelope *envelope = [[AGSEnvelope alloc]initWithXmin:29757.610204117 ymin:40055.0379682464 xmax:29884.6992302249 ymax:40236.6028660071 spatialReference:self.mapView.spatialReference]; //call method to set extent, pass in envelope [self.mapView zoomToEnvelope:envelope animated:YES]; self.mapView.callout.width = 195.0f; self.mapView.callout.accessoryButtonHidden = YES; [self.mapView.gps start]; [self.mapView centerAtPoint:self.mapView.gps.currentPoint animated:YES]; [self.activityView stopAnimating]; self.activityView.hidden = YES; } This line is causing the error self.mapView.layerDelegate = self;

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