help! terminate called after throwing an instance of 'NSException'

[hwilson]

Completely new to Xcode, using Xcode 4.
Made a simple app with tab bars. Each tab bar displays a different website (totaling up to 5).

I created the relevant controllers, etc. but I get this error: terminate called after throwing an instance of "NSException". What should I do?

Here is the code for one specific controller, ThirdViewController.

ThirdViewController.h

#import <UIKit/UIKit.h>


@interface ThirdViewController : UIViewController {
    
     IBOutlet UIWebView *Test;

}

@end

ThirdViewController.m

#import "ThirdViewController.h"


@implementation ThirdViewController

- (void)awakeFromNib
{
    [Test loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://google.com"]]];
}

/*
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad
{
    [super viewDidLoad];
}
*/

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    // Return YES for supported orientations
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}


- (void)didReceiveMemoryWarning
{
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];
    
    // Release any cached data, images, etc. that aren't in use.
}


- (void)viewDidUnload
{
    [super viewDidUnload];

    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}


- (void)dealloc
{
    [super dealloc];
}

@end

[smasher]

You'll need to paste the actual text of the exception. There are many kinds.

There's very little code in the class you posted, so I'm guessing either the .xib file is missing or the "view" outlet is not connected.

[hwilson]

Here's the error I get:

GNU gdb 6.3.50-20050815 (Apple version gdb-1518) (Sat Feb 12 02:52:12 UTC 2011)
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "x86_64-apple-darwin".sharedlibrary apply-load-rules all
Attaching to process 2933.
2011-03-26 01:22:29.311 Homework[2933:207] -[ThirdViewController _updateView]: unrecognized selector sent to instance 0x4b5a510
2011-03-26 01:22:29.314 Homework[2933:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[ThirdViewController _updateView]: unrecognized selector sent to instance 0x4b5a510'
*** Call stack at first throw:
(
	0   CoreFoundation                      0x00dcd5a9 __exceptionPreprocess + 185
	1   libobjc.A.dylib                     0x00f21313 objc_exception_throw + 44
	2   CoreFoundation                      0x00dcf0bb -[NSObject(NSObject) doesNotRecognizeSelector:] + 187
	3   CoreFoundation                      0x00d3e966 ___forwarding___ + 966
	4   CoreFoundation                      0x00d3e522 _CF_forwarding_prep_0 + 50
	5   UIKit                               0x002214ed -[UITabBar setItems:animated:] + 691
	6   UIKit                               0x0021dcee -[UITabBar initWithCoder:] + 220
	7   Foundation                          0x0078dc24 _decodeObjectBinary + 3296
	8   Foundation                          0x0078cd91 _decodeObject + 224
	9   UIKit                               0x000e1aa8 -[UITabBarController initWithCoder:] + 171
	10  Foundation                          0x0078dc24 _decodeObjectBinary + 3296
	11  Foundation                          0x0078cd91 _decodeObject + 224
	12  UIKit                               0x0021a979 -[UIRuntimeConnection initWithCoder:] + 212
	13  Foundation                          0x0078dc24 _decodeObjectBinary + 3296
	14  Foundation                          0x0078e9f5 -[NSKeyedUnarchiver _decodeArrayOfObjectsForKey:] + 1354
	15  Foundation                          0x0078f024 -[NSArray(NSArray) initWithCoder:] + 596
	16  Foundation                          0x0078dc24 _decodeObjectBinary + 3296
	17  Foundation                          0x0078cd91 _decodeObject + 224
	18  UIKit                               0x00219c36 -[UINib instantiateWithOwner:options:] + 804
	19  UIKit                               0x0021bab7 -[NSBundle(UINSBundleAdditions) loadNibNamed:owner:options:] + 168
	20  UIKit                               0x0002117a -[UIApplication _loadMainNibFile] + 172
	21  UIKit                               0x00021cf4 -[UIApplication _runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:] + 291
	22  UIKit                               0x0002c617 -[UIApplication handleEvent:withNewEvent:] + 1533
	23  UIKit                               0x00024abf -[UIApplication sendEvent:] + 71
	24  UIKit                               0x00029f2e _UIApplicationHandleEvent + 7576
	25  GraphicsServices                    0x01006992 PurpleEventCallback + 1550
	26  CoreFoundation                      0x00dae944 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52
	27  CoreFoundation                      0x00d0ecf7 __CFRunLoopDoSource1 + 215
	28  CoreFoundation                      0x00d0bf83 __CFRunLoopRun + 979
	29  CoreFoundation                      0x00d0b840 CFRunLoopRunSpecific + 208
	30  CoreFoundation                      0x00d0b761 CFRunLoopRunInMode + 97
	31  UIKit                               0x000217d2 -[UIApplication _run] + 623
	32  UIKit                               0x0002dc93 UIApplicationMain + 1160
	33  Homework                            0x00002429 main + 121
	34  Homework                            0x000023a5 start + 53
	35  ???                                 0x00000001 0x0 + 1
)
terminate called after throwing an instance of 'NSException'
(gdb)

[hwilson]

Originally Posted by smasher

You'll need to paste the actual text of the exception. There are many kinds.

There's very little code in the class you posted, so I'm guessing either the .xib file is missing or the "view" outlet is not connected.

The xib file isn't missing, what do u mean about the "view" outlet?

I connected "Test" to the UIWebView in the interface builder and it still doesn't work..

[JasonR]

This is your crash error right here:

-[ThirdViewController _updateView]: unrecognized selector sent to instance 0x4b5a510

You are calling a method called "updateView" on your view controller that you have not defined correctly. It could be as simple as a misspelling.

[hwilson]

Originally Posted by JasonR

This is your crash error right here:

-[ThirdViewController _updateView]: unrecognized selector sent to instance 0x4b5a510

You are calling a method called "updateView" on your view controller that you have not defined correctly. It could be as simple as a misspelling.

Ok, but where exactly am I calling this updateView method? The view controller is in my first post and i don't see updateView anywhere..

[smasher]

Are you setting up the tabview in code or in a .xib? This can happen if you pass UIViewControllers instead of a UITabBarItems in -[UITabBar setItems: animated:]

[hwilson]

Originally Posted by smasher

Are you setting up the tabview in code or in a .xib? This can happen if you pass UIViewControllers instead of a UITabBarItems in -[UITabBar setItems: animated:]

Using interface builder

[smasher]

You are not calling _updateView yourself; that's something that UITabBar calls on its UITabBarItems.

It seems to be crashing before any of your code is run, so I still suspect one of your .xib files. I'd back up your project and start deleting items from the .xib one at a time until the crashing stops. Then you'll have some idea where to look next.

I'd start with wherever ThirdViewController is used in the nib; make sure it's not a child of a tab bar. It should be the child of a tab bar controller.

This could also happen if you're incorrectly releasing a UITabBarItem somewhere, but I doubt it.