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I am working on a project on iPhone. I am now initiating a new UIViewController from another UIViewController, and then switch between them. Here is my code. iGreenAppDelegate *delegate = [UIApplication sharedApplication].delegate; if(checkInViewController) { [checkInViewController release]; checkInViewController = nil; } checkInViewController = [[CheckInViewController alloc] initWithCheckpoint:checkpoint]; [UIView beginAnimations:nil context:nil]; [UIView setAnimationDuration:0.8]; [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:[delegate window] cache:YES]; [[delegate rootTabBarController].view removeFromSuperview]; [[delegate window] addSubview:checkInViewController.view]; [UIView commitAnimations]; The Problem is the second time I initiate the UIViewController, I want to release it to avoid causing memory leak. The Debugger displays iGreen(916,0x3f60348c) malloc: error for object 0x130350: incorrect checksum for freed object - object was probably modified after being freed. set a breakpoint in malloc_error_break to debug This is strange because similar codes in other parts don't return such error. Moreover, I tried autorelease, but the program will immediately crash and the Debugger says I am modifying finalized layers. I've been working on the problem for a whole night, and still confused about it.

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