I don't know what wrong with this code but everytime when I run the app, after the Menu is shown, the app crash.

    NSString * path = [[NSBundle mainBundle] pathForResource:@"tung" ofType:@"doc"];

    UIDocumentInteractionController *docController = [UIDocumentInteractionController interactionControllerWithURL:[NSURL fileURLWithPath:path]];

    docController.delegate = self;

    //[docController presentPreviewAnimated:YES];

    CGRect rect = CGRectMake(0, 0, 300, 300);
    [docController presentOptionsMenuFromRect:rect inView:self.view animated:YES];

Error I got:

* Terminating app due to uncaught exception 'NSGenericException', reason: '-[UIPopoverController dealloc] reached while popover is still visible.'

What should I do now ?