title: return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class])); Thread 1: SIGBART
body: <p>Whenever I try and run my app, this is the error message that occurs</p>
  
  <p><strong>viewController.h</strong></p>
  
  <pre><code>#import "ViewController.h"
  
  @interface ViewController ()
  
  @end
  </code></pre>
  
  <hr>
  
  <p><strong>viewController.m</strong></p>
  
  <pre><code>@implementation ViewController
  
  - (void)viewDidLoad {
  
      // Do any additional setup after loading the view, typically from a nib
      [super viewDidLoad];
  
      label.text = @"Number";
  
  }
  
  - (void)didReceiveMemoryWarning {
  
      // Dispose of any resources that can be recreated
      [super didReceiveMemoryWarning];
  
  }
  
  
  - (IBAction)numberButton {
  
      int number;
      number = arc4random() %100;
  
      // Turns the integer (number) into a string
      NSString *numberDisplay = [NSString stringWithFormat: @"%i", number];
  
      // Because the text has to be a string, i.e. an NSString
      label.text = numberDisplay;
  
  }
  
  - (IBAction)numButton {
  
      int number;
      number = arc4random() %100;
  
      // Turns the integer (number) into a string
      NSString *numberDisplay = [NSString stringWithFormat: @"%i", number];
  
      // Because the text has to be a string, i.e. an NSString
      label.text = numberDisplay;
  
  }
  
  - (IBAction)color {
  
      int color;
      color = rand() %4;
  
      switch (color) {
          case 0:
              label.textColor = [UIColor redColor];
              break;
  
          case 1:
              label.textColor = [UIColor purpleColor];
              break;
  
          case 2:
              label.textColor = [UIColor blueColor];
              break;
  
          case 3:
              label.textColor = [UIColor greenColor];
              break;
  
          default:
              break;
      }
  
  }
  
  - (IBAction)fontSize {
  
      int fontSize;
      fontSize = rand() %6;
  
      switch (fontSize) {
          case 0:
              [label setFont: [UIFont fontWithName:@"" size:5]];
              break;
  
          case 1:
              [label setFont: [UIFont fontWithName:@"" size: 15]];
              break;
  
          case 2:
              [label setFont: [UIFont fontWithName:@"" size: 25]];
              break;
  
          case 3:
              [label setFont: [UIFont fontWithName:@"" size: 35]];
              break;
  
          case 4:
              [label setFont: [UIFont fontWithName:@"" size: 40]];
              break;
  
          case 5:
              [label setFont: [UIFont fontWithName:@"" size: 45]];
              break;
  
          default:
              break;
      }
  }
  
  @end
  </code></pre>
  
  <p>My .h has all of the same actions. I have checked and rechecked if there were spelling mistakes and/or connection mistakes. What else could be the problem?</p>