_BSMachError what does it mean?

Question

Objective-C

_BSMachError: (os/kern) invalid capability (20)
_BSMachError: (os/kern) invalid name (15)
can't determine what the problem is

Answer 1

Just jumped out. Arose due to the fact that in UIAlertController -> UIAlertAction -> handler commented out
//[self.presentedViewController dismissViewControllerAnimated:YES completion:nil];
because now UIAlert has become a control, it must be removed, it can be seen that the link in ARC remains.