Unrecognized selector sent to instance error from Utility App navigation controller view
- (IBAction)sendMail;

- (IBAction)sendMail
{
if ([MFMailComposeViewController canSendMail])
{
    MFMailComposeViewController *mfViewController = [[MFMailComposeViewController alloc] init];
    mfViewController.mailComposeDelegate = self;

    [self presentModalViewController:mfViewController animated:YES];

}
else
{
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Status:" message:@"Your phone is not currently configured to send mail." delegate:nil cancelButtonTitle:@"ok" otherButtonTitles:nil];

    [alert show];
}

reason: '-[UIViewController sendMail]: unrecognized selector sent to instance

MyCustomViewController *controller = [[MyCustomViewController alloc] initWithNibName:@"ExMobSendFeedback" bundle:nil];
controller.title = @"Feedback";
[self.navigationController pushViewController:controller animated:YES];
[controller release];