iPhone Map application ipa crashing on iOS6 - iphone

Question

My Map application is on iTune market which runs good on iOS 4 and iOS 5. I have developed this application using Xcode 3.2, iPhone sdk 4.2 on Mac mini having Mac OS 10.6.8.
This application .ipa file is crashing after launching on iOS 6. I am developing app on MacMini and I could not able to run xcode 4.5 to rectify the crash. I am pasting some code which runs on launching. If there is some deprecated methods which causes crash then please help because I am not able to check this code without Mac OS 10.7(Lion)..
- (void)viewDidLoad {
if([appDelegate.markers count] == 0 && [mapView.annotations count] == 0 && UserId.data == 0)
{
[self performSelector:#selector(launchActivity) withObject:nil afterDelay:1.0];
}
}
- (void) launchActivity {
Reachability *r = [Reachability reachabilityWithHostName:#"www.google.com"];
NetworkStatus internetStatus = [r currentReachabilityStatus];
if ((internetStatus != ReachableViaWiFi) && (internetStatus != ReachableViaWWAN))
{
UIAlertView *myAlert = [[UIAlertView alloc] initWithTitle:#"No Internet Connectivity!" message:#"This app require an internet connection via WiFi or cellular network to work." delegate:nil cancelButtonTitle:#"Ok" otherButtonTitles:nil];
[myAlert show];
[myAlert release];
}
else
{
locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
locationManager.distanceFilter = kCLDistanceFilterNone; // whenever we move
locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters; // 100 m
[locationManager startUpdatingLocation];
if([self.mapView.annotations count] == 1)
{
}
if (locationManager.location == nil)
{
}
else
{
// Change map region using span (degrees)...
MKCoordinateSpan span = MKCoordinateSpanMake(0.001, 0.001);
MKCoordinateRegion region = MKCoordinateRegionMake
(locationManager.location.coordinate, span);
[mapView setRegion:region animated:YES];
}
mapView.showsUserLocation = YES;
BOOL locationAllowed = [CLLocationManager locationServicesEnabled];
if (locationAllowed==NO)
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Location Service Disabled"
message:#"To re-enable, please go to Settings and turn on Location Service for this app."
delegate:nil
cancelButtonTitle:#"OK"
otherButtonTitles:nil];
[alert show];
[alert release];
return;
}
else
{
[NSThread detachNewThreadSelector:#selector(updateFilterProgress) toTarget:self withObject:nil]; //NSthread not taken because Default.png stay while loading the results
//========================================================================================== ==================================
//Searching Showroom Locations withing the radius
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
appDelegate = (HettichLocatorAppDelegate *)[[UIApplication sharedApplication] delegate];
CLLocationCoordinate2D location;
NSString *url = [[NSString alloc] initWithFormat:#"http://www.company.com.au/directory/phpsqlsearch_genxml.php?lat=%f&lng=%f&radius=5",locationManager.location.coordinate.latitude,locationManager.location.coordinate.longitude];
radiusinurl.text = #"5km";
NSURL *URL = [NSURL URLWithString:url];
NSXMLParser *xmlParser = [[NSXMLParser alloc] initWithContentsOfURL:URL];
//Initialize the delegate.
XMLParser *parser = [[XMLParser alloc] initXMLParser];
//Set delegate
[xmlParser setDelegate:parser];
//Start parsing the XML file.
BOOL success = [xmlParser parse];
[parser release];
[xmlParser release];
//[URL release];
[url release];
if(success)
{
annobjs = [[NSMutableArray array] retain];
if([appDelegate.markers count] == 0)
{
//some logic
}
else
{
for (int i = 0; i < [appDelegate.markers count]; i++)
{
marker *aMarker = [appDelegate.markers objectAtIndex:i];
location.latitude = [aMarker.lat floatValue];
location.longitude =[aMarker.lng floatValue];
AddressAnnotation *annobj = [[AddressAnnotation alloc] initWithCoordinate:location];
annobj.title = aMarker.name;
annobj.subtitle = aMarker.address;
[annobjs addObject:annobj];
[mapView addAnnotation:annobj];
CLLocationCoordinate2D ausLoc = {location.latitude,location.longitude}; //for zoom in the showroom results region
MKCoordinateSpan ausSpan = MKCoordinateSpanMake(0.108889, 0.169922);
MKCoordinateRegion ausRegion = MKCoordinateRegionMake(ausLoc, ausSpan);
mapView.region = ausRegion;
[annobj release];
[_tableView reloadData];
}
}
}
else
{
UIAlertView *myAlert = [[UIAlertView alloc] initWithTitle:#"" message:#"Unable to find the results." delegate:nil cancelButtonTitle:#"Ok" otherButtonTitles:nil];
[myAlert show];
[myAlert release];
}
[pool release];
}
}
}
}