data paramter showing nil and its crashing : - (IBAction)loginAction:(id)sender {
//    [self.eMail resignFirstResponder];
//    [self.password resignFirstResponder];
    NSString *post =[NSString stringWithFormat:@"Email=%@&Password=%@",self.eMail.text,self.password.text];
    NSString * loginURL = @"http://75.101.159.160:8222/api/mobileappapi/user/login"; // Login URL
    
    NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
    NSHTTPURLResponse   * response;
    NSError             * error;
    NSMutableURLRequest * request;
    request = [[NSMutableURLRequest alloc]initWithURL:nil cachePolicy:NSURLRequestReloadIgnoringLocalAndRemoteCacheData timeoutInterval:60.0];
    [request setHTTPMethod:@"POST"];
    [request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
    [request setValue:@"application/json" forHTTPHeaderField:@"Accept"];
    [request setHTTPBody:postData];
    request.URL = [NSURL URLWithString:[NSString stringWithFormat:@"%@",loginURL]];
    error       = nil;
    response    = nil;
    NSData* jsonUpdateDate = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
    
   // jsonUpdateDate = [NSURLConnection sendSynchronousRequest:request returningResponse:response error:&error];
    
    
    NSDictionary* resultsDictionary = [NSJSONSerialization JSONObjectWithData:jsonUpdateDate options:0 error:&error];
    NSLog(@"%@",resultsDictionary);
    
    
    NSString *userRole = [resultsDictionary objectForKey:@"UserRole"];
    if (userRole != (NSString*)[NSNull null]) {
    if ([userRole isEqualToString:@"Passenger"]) {
        // SuccessuserRole
        HomeScreen *obj=[self.storyboard instantiateViewControllerWithIdentifier:@"HomeScreen"];
        [self presentViewController:obj animated:NO completion:nil];
    }
    else if ([userRole isEqualToString:@"Driver"]){
        
        SelectVehicle *obj=[self.storyboard instantiateViewControllerWithIdentifier:@"SelectVehicle"];
        [self presentViewController:obj animated:NO completion:nil];

        }
    }
}**strong text**