“LLDB crash”

i try to unwrapcuentita.cubitoCHocolate = Int(chocolate.text!) ?? 0but it crash the appand this error appears in the console2018-05-09 14:48:22.123528-0500 venta[4355:2000820] -[venta.items continuar:]: unrecognized selector sent to instance 0x155d428f02018-05-09 14:48:22.127562-0500 venta[4355:2000820] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[venta.items continuar:]: unrecognized selector sent to instance 0x155d428f0'*** First throw call stack:(0x184296d8c 0x1834505ec 0x1842a4098 0x18e34ade4 0x18429c5c8 0x18418241c 0x18dfc66c8 0x18e0e78a4 0x18dfcc77c 0x18e1021dc 0x18e5a7dd8 0x18e5a4b50 0x18423e910 0x18423c238 0x18423c884 0x18415cda8 0x18613f020 0x18e13d78c 0x1045fd02c 0x183bedfc0)libc++abi.dylib: terminating with uncaught exception of type NSException(lldb)

I am on Xcode 12.4 and also having this problem with my Flutter project. Earlier today it was opening fine, then I quit Xcode, built a new ios version of the app through VS terminal, then tried to reopen my project in Xcode but nothing happens when I click on the .xcworkspace file, it doesn't open anything. It does open other projects successfully, but still not the one above. After restarting Mac and trying again, it still does not open, but gave me the message: Xcode quit unexpectedly Process: Xcode [2379] Path: /Applications/Xcode.app/Contents/MacOS/Xcode Identifier: com.apple.dt.Xcode Version: 12.4 (17801) Build Info: IDEFrameworks-17801000000000000~7 (12D4e) App Item ID: 497799835 App External ID: 839994694 Code Type: X86-64 (Native) Parent Process: ??? [1] Responsible: Xcode [2379] User ID: 501 Date/Time: 2021-04-02 18:33:36.412 +0100 OS Version: Mac OS X 10.15.7 (19H2) Report Version: 12 Bridge OS Version: 4.6 (17P6610) Anonymous UUID: 539C0A09-D3B8-3B12-BC86-25902B07D97B Tim

Ed and I discussed the issue behinds the scenes, and so I am chiming in to comment the following error from the Core Data perspective. Regarding the following error: error: :8:15: error: cannot convert value of type 'NSFetchRequest' to expected argument type 'NSFetchRequest' context.fetch(request) ^ :8:15: note: arguments to generic parameter 'ResultType' ('ResultType' and 'any NSFetchRequestResult') are expected to be equal This seems to indicate that you were passing an NSFetchRequest object tied to one entity as an argument to a closure (configurationBlock?) and the closure expects (or infers) a fetch request tied to the other entity. Since the potential type mismatch happens in runtime, it's hard to reason the why by simply reading the piece of code. Do you have a minimal sample project that reproduce the issue? You mentioned that the error does not occur on every call, but since you've figured out the line triggering the crash and use lldb to trigger the crash report, I'd think

Okay, looks like this is entirely down to SwiftUI being weird. It appears to be gaming the UITabBar system. Each time you tap to select a tab, SwiftUI is changing the view controller list for the tab bar. For n tabs, it contains n-1 plain UIViewControllers with empty views, and 1 HostingController<_ViewList_View>. Tapping on a tab will update the content of hosting controller to contain the content of the SwiftUI tab, and it will reassign the UITabBarController's viewControllers property—it moves the HostingController to the index of the tapped tab, and puts a new empty UIViewController at its old position.Here's the output of that property as I walk through four SwiftUI tabs:(lldb) po [$21 viewControllers] <__NSArrayM 0x6000015091d0>( <_TtGC7SwiftUI19UIHostingControllerVS_14_ViewList_View_: 0x7fddabe0c600>, <UIViewController: 0x7fdd9bc2eeb0>, <UIViewController: 0x7fddabf2bd80>, <UIViewController: 0x7fddabd11b40> ) (lldb) po [$21 viewControllers] <__NSA