problem with navigation based template-Collection of common programming errors

hii every one

i am creating a navigation based application & i am designing screens programatically , i need to have 2 bar buttons ie left barbutton item & right bar button item so i have used following code in – (void)loadView method but its crashing when controller enters loadview method,,can any one tell me whats wrong in this code, thanx in advance

  self.title = @"Add Item";
 self.navigationItem.leftBarButtonItem = [[[UIBarButtonItem alloc] 
 initWithBarButtonSystemItem:UIBarButtonSystemItemCancel 
 target:self action:@selector(cancel_Clicked:)] autorelease];

 self.navigationItem.rightBarButtonItem = [[[UIBarButtonItem alloc] 
 initWithBarButtonSystemItem:UIBarButtonSystemItemSave 
 target:self action:@selector(save_Clicked:)] autorelease];
 self.view.backgroundColor = [UIColor groupTableViewBackgroundColor];