iphone - Objc_msgSend and app crash -

when trying launch app on simulator (3.1.3 , xcode 3.1.4), shows me objc_msgsend , application not launch. happens when alloc nsmutable array 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 want 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 objectatindex:3] doublevalue]; } else {     //show error }  cllocationcoordinate2d location; location.latitude = latitude; location.longitude = longitude;   return location;     } 

problem occur when alloc locationarray, whats wrong me, please thanks

locationarray = [[nsmutablearray alloc] initwithobjects:@"new delhi", @"faridabad",@"meerut"];

try

locationarray = [[nsmutablearray alloc] initwithobjects:@"new delhi", @"faridabad",@"meerut", nil];

from the nsarray docs see initwithobjects: requires termination nil. if don't want that, , know how many have, can use initwithobjects:count: