Objc_msgSend and app crash

When I trying to launch my app on simulator (3.1.3 , Xcode 3.1.4), it shows me objc_msgSend and application does not launch. This happens only when I alloc NSMUtable Array This is my code part, in viewDidLoad,

 -(void)viewDidLoad{

   locationArray = [[NSMutableArray alloc] initWithObjects:@"new delhi", @"faridabad",@"meerut"];
   str1=[locationArray objectAtIndex:0];
   str2=[locationArray objectAtIndex:1];

      [super viewDidLoad];
 } 

Then I want to use locationArray objects in following method;

 -(CLLocationCoordinate2D) addressLocation1{

double latitude = 0.0;
double longitude = 0.0;
NSString *str= [locationArray NSString *str= [locationArray objectAtIndex:0];

    //NSString *str= @"new delhi"

NSString *urlString = [NSString stringWithFormat:@"http://maps.google.com/maps/geo?q=%@&output=csv", 
                       [str stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
NSString *locationString = [NSString stringWithContentsOfURL:[NSURL URLWithString:urlString]];
NSArray *listItems = [locationString componentsSeparatedByString:@","];


if([listItems count] >= 4 && [[listItems objectAtIndex:0] isEqualToString:@"200"]) {
    latitude = [[listItems objectAtIndex:2] doubleValue];
    longitude = [[listItems 开发者_运维百科objectAtIndex:3] doubleValue];
}
else {
    //Show error
}

CLLocationCoordinate2D location;
location.latitude = latitude;
location.longitude = longitude;


return location;

   }

problem occur only when alloc the locationArray, whats wrong with me, please help thanks

locationArray = [[NSMutableArray alloc] initWithObjects:@"new delhi", @"faridabad",@"meerut"];

Try

locationArray = [[NSMutableArray alloc] initWithObjects:@"new delhi", @"faridabad",@"meerut", nil];

From The NSArray docs you see that for initWithObjects: it requires termination with nil. If you don't want to do that, and you know how many you have, you can use initWithObjects:count: