Erreur étrange: Impossible de rendre le polygone

J'utilise un MKMapView pour afficher environ 700 annotations au total. Mon problème est que parfois je reçois un gros journal comme celui-ci:

 2013-06-05 17:32:12.395 tiet[1493:1c52b] Can't render polygon (can't reserve indicies: 324): featureID: 1547811419 key: 73.35.7 (512) 2013-06-05 17:32:12.396 tiet[1493:1c52b] Can't render polygon (can't reserve indicies: 480): featureID: 1547811419 key: 73.35.7 (512) 2013-06-05 17:32:12.396 tiet[1493:1c52b] Can't render polygon (can't reserve indicies: 30): featureID: 1547811419 key: 73.35.7 (512) 2013-06-05 17:32:12.396 tiet[1493:1c52b] Can't render polygon (can't reserve indicies: 18): featureID: 1547811419 key: 73.35.7 (512) 2013-06-05 17:32:12.396 tiet[1493:1c52b] Can't render polygon (can't reserve indicies: 18): featureID: 1547811419 key: 73.35.7 (512) 2013-06-05 17:32:12.397 tiet[1493:1c52b] Can't render polygon (can't reserve indicies: 1818): featureID: 1547811419 key: 73.35.7 (512) 2013-06-05 17:32:12.397 tiet[1493:1c52b] Can't render polygon (can't reserve indicies: 18): featureID: 1547811419 key: 73.35.7 (512) 2013-06-05 17:32:12.397 tiet[1493:1c52b] Can't render polygon (can't reserve indicies: 18): featureID: 1547811419 key: 73.35.7 (512) 2013-06-05 17:32:12.397 tiet[1493:1c52b] Can't render polygon (can't reserve indicies: 18): featureID: 1547811419 key: 73.35.7 (512) 2013-06-05 17:32:12.397 tiet[1493:1c52b] Can't render polygon (can't reserve indicies: 234): featureID: 1547811419 key: 73.35.7 (512) 2013-06-05 17:32:12.397 tiet[1493:1c52b] Can't render polygon (can't reserve indicies: 90): featureID: 1547811419 key: 73.35.7 (512) 2013-06-05 17:32:12.398 tiet[1493:1c52b] Can't render polygon (can't reserve indicies: 174): featureID: 1547811419 key: 73.35.7 (512) 2013-06-05 17:32:12.398 tiet[1493:1c52b] Can't render polygon (can't reserve indicies: 18): featureID: 1547811419 key: 73.35.7 (512) 2013-06-05 17:32:12.398 tiet[1493:1c52b] Can't render polygon (can't reserve indicies: 162): featureID: 1547811419 key: 73.35.7 (512) 2013-06-05 17:32:12.398 tiet[1493:1c52b] Can't render polygon (can't reserve indicies: 186): featureID: 1547811419 key: 73.35.7 (512) 2013-06-05 17:32:12.398 tiet[1493:1c52b] Can't render polygon (can't reserve indicies: 114): featureID: 1547811419 key: 73.35.7 (512) 2013-06-05 17:32:12.398 tiet[1493:1c52b] Can't render polygon (can't reserve indicies: 18): featureID: 1547811419 key: 73.35.7 (512) 2013-06-05 17:32:12.398 tiet[1493:1c52b] Can't render polygon (can't reserve indicies: 120): featureID: 1547811419 key: 73.35.7 (512) 2013-06-05 17:32:12.399 tiet[1493:1c52b] Can't render polygon (can't reserve indicies: 78): featureID: 1547811419 key: 73.35.7 (512) 2013-06-05 17:32:12.399 tiet[1493:1c52b] Can't render polygon (can't reserve indicies: 126): featureID: 1547811419 key: 73.35.7 (512) 2013-06-05 17:32:12.399 tiet[1493:1c52b] Can't render polygon (can't reserve indicies: 192): featureID: 1547811419 key: 73.35.7 (512) 2013-06-05 17:32:12.399 tiet[1493:1c52b] Can't render polygon (can't reserve indicies: 18): featureID: 1547811419 key: 73.35.7 (512) 2013-06-05 17:32:12.399 tiet[1493:1c52b] Can't render polygon (can't reserve indicies: 30): featureID: 1547811419 key: 73.35.7 (512) 2013-06-05 17:32:12.400 tiet[1493:1c52b] Can't render polygon (can't reserve indicies: 156): featureID: 1547811419 key: 73.35.7 (512) 2013-06-05 17:32:12.400 tiet[1493:1c52b] Can't render polygon (can't reserve indicies: 18): featureID: 1547811419 key: 73.35.7 (512) 2013-06-05 17:32:12.400 tiet[1493:1c52b] Can't render polygon (can't reserve indicies: 18): featureID: 1547811419 key: 73.35.7 (512) 2013-06-05 17:32:12.400 tiet[1493:1c52b] Can't render polygon (can't reserve indicies: 84): featureID: 1547811419 key: 73.35.7 (512) 2013-06-05 17:32:12.400 tiet[1493:1c52b] Can't render polygon (can't reserve indicies: 30): featureID: 1547811419 key: 73.35.7 (512) 

J'ai été incapable de find quoi que ce soit concernant l'erreur, et je suis complètement déconcerté. Il n'y a pas de véritables divergences visuelles que je peux voir, et il n'y a pas d'autres erreurs. Quelqu'un a-t-il une idée de ce dont il s'agit?

 I also had the same problem once in iOS6.1. I was zooming out the map based on a coordinate which was (0.00000,0.00000). In my code:- CLLocationCoordinate2D theCoordinate ; theCoordinate.latitude = [[self.dicOfMAP objectForKey:@"latitude"] doubleValue]; theCoordinate.longitude = [[self.dicOfMAP objectForKey:@"longitude"] doubleValue]; self.pointAnnotation.coordinate = theCoordinate; the value of theCoordinate was(0.0,0.0). So check the value of coordinate.