SIGABRT Error After Snippets Added to Source Code - iphone

Question

So after adding the following snippets to my source code, the application refuses to run and gives me a SIGABRT error:
CIALBrowserViewController.h
UIBarButtonItem *homeButtonItem;
CIALBrowserViewController.m
#interface CIALBrowserViewController ()
- (void)goHome:(id)sender;
..
homeButtonItem = [[[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:#"home.png"]
style:UIBarButtonItemStylePlain
target:self
action:#selector(goHome:)] autorelease];
..
- (void)goHome:(id)sender {
NSURL *url = [NSURL URLWithString:#"http://google.ca/"];
NSURLRequest *requestObj = [NSURLRequest requestWithURL:url];
[webView loadRequest:requestObj];
}
The SIGABRT Error
2012-06-17 14:15:15.130 CIALBrowser[1753:707] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSArrayM insertObject:atIndex:]: object cannot be nil'
*** First throw call stack:
(0x354fa88f 0x378a1259 0x3544f1d7 0x5f8b 0x32f67c17 0x2a67 0x32f66cab 0x32f607dd 0x32f2eac3 0x32f2e567 0x32f2df3b 0x370ed22b 0x354ce523 0x354ce4c5 0x354cd313 0x354504a5 0x3545036d 0x32f5f86b 0x32f5ccd5 0x28df 0x2878)
terminate called throwing an exception(lldb)
Heres the full source code to CIALBrowserViewController.m: http://pastebin.com/uuUgi7Dc

Answer 1

In else section of if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad), there is no homeButtonItem alloced or inited, so homeButtonItem is nil. Then [buttons addObject:homeButtonItem]; will crash, because you are adding a nil object to array.

Answer 2

THe SIGABRT error suggests that somewhere in your code you use the method insertObject:atIndex: and use nil as the first parameter, which is not allowed, throwing an error. I went to your code on paste bin and did not see that method called there, so the error is likely in another file.
Hope this helps!