Hi , i try to load a view via UIPopover but my app crash after tap the popover button , i tried to solve it but i don't understand ! here is my code :

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(IBAction)calendarPopUp:(id)sender {

 PopViewController *cal = [[PopViewController alloc]init];
//The compiler tells me the problem comes from this line :
 UIPopoverController *popOver = [[UIPopoverController alloc] initWithContentViewController:cal];
 [popOver setDelegate:self];
 [popOver presentPopoverFromRect:CGRectMake(113, 64, 226, 129) inView:self permittedArrowDirections:UIPopoverArrowDirectionDown animated:YES];
 [popOver setPopoverContentSize:CGSizeMake(226, 129)];
}