Thread Signal SIGABRT Exception

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I'm curious to know why I'm receiving an exception on this code and as to what this exception means. When I remove the for loop, as indicated below, it works fine. When I include it, I get an exception.

@interface MasterViewController ()

@property (nonatomic, strong) NSArray *venues;

@end

@implementation MasterViewController

- (void)awakeFromNib
{
    [super awakeFromNib];
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    [self configureRest];
    [self loadVenues];
}

- (void) configureRest {

    // initialize AFNetworking HTTPClient
    NSURL *baseURL = [NSURL URLWithString:@"http://ift.tt/1jfBDuI"];
    AFHTTPClient *client = [[AFHTTPClient alloc] initWithBaseURL:baseURL];

    // initialize RestKit
    RKObjectManager *objectManager = [[RKObjectManager alloc] initWithHTTPClient:client];

    // setup object mappings
    RKObjectMapping *venueMapping = [RKObjectMapping mappingForClass:[Venue class]];
    [venueMapping addAttributeMappingsFromArray:@[@"name"]];

    // register mappings with the provider using a response descriptor
    RKResponseDescriptor *responseDescriptor =
    [RKResponseDescriptor responseDescriptorWithMapping:venueMapping
                                                 method:RKRequestMethodGET
                                            pathPattern:@"/v2/venues/search"
                                                keyPath:@"response.venues"
                                            statusCodes:[NSIndexSet indexSetWithIndex:200]];

    [objectManager addResponseDescriptor:responseDescriptor];
    // define location object mapping
    RKObjectMapping *locationMapping = [RKObjectMapping mappingForClass:[Location class]];
    [locationMapping addAttributeMappingsFromArray:@[@"address", @"city", @"country", @"crossStreet", @"postalCode", @"state", @"distance", @"lat", @"lng"]];

    // define relationship mapping
    [venueMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"location" toKeyPath:@"location" withMapping:locationMapping]];

}

-(void) loadVenues {
    NSString *latLon = @"34.0500, -118.2500"; // approximate latLon of The Mothership (a.k.a Apple headquarters)
    NSString *clientID = kCLIENTID;
    NSString *clientSecret = kCLIENTSECRET;
    //34.0500° N, 118.2500

    NSDictionary *queryParams = @{@"ll" : latLon,
                                  @"client_id" : clientID,
                                  @"client_secret" : clientSecret,
                                  @"categoryId" : @"4bf58dd8d48988d1e0931735",
                                  @"v" : @"20140118"};

    [[RKObjectManager sharedManager] getObjectsAtPath:@"/v2/venues/search"
                                           parameters:queryParams
                                              success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
                                                  _venues = mappingResult.array;

                                                  NSMutableArray *temp = [(NSArray*)_venues mutableCopy];
                                                 //this for loop 
                                                  for (int i =0; i < _venues.count; i++)

                                                  {
                                                      int index = 0;
                                                      for (Venue *venue in temp)
                                                      {
                                                          if(venue.location.distance > 0)
                                                          {
                                                              Venue *holder= [temp objectAtIndex:index];
                                                              [temp removeObjectAtIndex:index];
                                                              [temp addObject:[temp objectAtIndex:index+1]];
                                                              //replace a with a+1
                                                              [temp replaceObjectAtIndex:index+1 withObject:holder
                                                               ];
                                                              //[temp addObject:holder atIndex: index+1];
                                                              //a[i+1]=holder;
                                                              index++;
                                                          }
                                                          else {index++;}

                                                      }

                                                      }


                                                      _venues = temp;
                                                      [self.tableView reloadData];
                                                  }
                                              failure:^(RKObjectRequestOperation *operation, NSError *error) {
                                                  NSLog(@"What do you mean by 'there is no coffee?': %@", error);
                                              }];
                                              }

asked 34 secs ago

user3205630

14