App crashes on start - objective-c

Question

Hi I was doing some testing earlier and my app was running just fine. I wanted to do some more testing so I decided to remove the app from my device and then reinstall it by running.
Well now for some reason I get to the stage where my splash screen shows up and then it crashes and I get the error:
Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayI objectAtIndex:]: index 3 beyond bounds [0 .. 2]'
This obviously means theres an array out of bounds correct? But why now and how can I found out where and what view controller this is happening on? How could it run before and now all of a sudden when I try reinstalling the app through running it again I get this error?
Thanks
EDIT
The error is with the array in the following code
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
exploreViewController *view1 = [[exploreViewController alloc] initWithNibName:#"exploreViewController" bundle:nil];
view1.title= #"Explore";
Upcoming *view2 = [[Upcoming alloc] initWithNibName:#"Upcoming" bundle:nil];
view2.title = #"Upcoming";
calcViewController *view3 = [[calcViewController alloc] initWithNibName:#"calcViewController" bundle:nil];
view3.title = #"Calc";
UINavigationController *nav1 = [[UINavigationController alloc] initWithRootViewController:view1];
UINavigationController *nav2 = [[UINavigationController alloc] initWithRootViewController:view2];
UINavigationController *nav3 = [[UINavigationController alloc] initWithRootViewController:view3];
self.tabBarController = [[[UITabBarController alloc] init] autorelease];
self.tabBarController.viewControllers = [NSArray arrayWithObjects:nav1,nav2,nav3,nil];
self.tabBarItem = [[[UITabBarItem alloc] init] autorelease];
NSArray *tabBarItems = self.tabBarController.tabBar.items;
UIImage *tab1 = [UIImage imageNamed:#"85-trophy.png"];
UIImage *tab2 = [UIImage imageNamed:#"12-eye.png"];
UIImage *tab3 = [UIImage imageNamed:#"237-key.png"];
NSArray *tabBarImages = [[[NSArray alloc] initWithObjects:tab1, tab2, tab3,nil]autorelease];
NSInteger tabBarItemCounter;
for (tabBarItemCounter = 0; tabBarItemCounter < [tabBarItems count]; tabBarItemCounter++)
{
tabBarItem = [tabBarItems objectAtIndex:tabBarItemCounter];
tabBarItem.image = [tabBarImages objectAtIndex:tabBarItemCounter];
}

Answer 1

Well, the reason for this crash is the following:
You are adding five items to your tabBar (nav1, nav2, nav3, nav4, nav6), but you only have three images for your tabs (tab1, tab2, tab3). So when the for loop reaches the fourth tab it crashes because tabBarImages only contains three objects.
Apart from that your code looks a bit messy - which could be the reason for not seeing the error on first sight.
// edit
You are complicating things - just try the following piece of code
UINavigationController *nav1 = [[UINavigationController alloc] initWithRootViewController:__your_viewController__];
nav1.title = #"Explore";
nav1.tabBarItem.image = [UIImage imageNamed:#"85-trophy.png"];
UINavigationController *nav2 = [[UINavigationController alloc] initWithRootViewController:__your_viewController__];
nav2.title = #"Upcoming";
nav2.tabBarItem.image = [UIImage imageNamed:#"12-eye.png"];
UINavigationController *nav3 = [[UINavigationController alloc] initWithRootViewController:__your_viewController__];
nav3.title = #"Calc";
nav3.tabBarItem.image = [UIImage imageNamed:#"237-key.png"];
UITabBarController *tabBarController = [[UITabBarController alloc] init];
[tabBarController setViewControllers:[NSArray arrayWithObjects:nav1, nav2, nav3, nil]];
[nav1 release];
[nav2 release];
[nav3 release];