Xcode: iOS app suddenly always crashes on launch - ios

Question

I created a quite simple app that can receive push notifications and display content. This is working without any problems since month.
Since yesterday the app suddenly crashes every time I want to launch it.
I'm using an iPhone 8 Plus with iOS 12.4.1. Restarting the app, hard and soft reset of the iPhone didn't help.
The console says the following:
fehler 07:37:35.510970 +0200 assertiond Unable to obtain a task name
port right for pid 542: (os/kern) failure (0x5)
fehler 07:37:35.511100 +0200 assertiond Failed to start job with error
{
description = "Unable to get valid task name port right for pid 542";
failureReason = "The process failed to exec";
recoverySuggestion = "Consult /var/log/com.apple.xpc.launchd/launchd.log for more information"; }
fehler 07:37:35.511894 +0200 SpringBoard [MyCompany.MyApp] Bootstrap
failed with error:
fehler 07:37:35.512091 +0200 SpringBoard Bootstrapping failed for
with
error: Error Domain=BKSProcessErrorDomain Code=1 "Unable to bootstrap
process with bundleID MyCompany.MyApp"
UserInfo={NSLocalizedDescription=Unable to bootstrap process with
bundleID MyCompany.MyApp, BKSProcessExitReason=0,
NSLocalizedFailureReason=Failed to start job,
NSUnderlyingError=0x28146e760 {Error Domain=NSPOSIXErrorDomain Code=3
"No such process" UserInfo={NSLocalizedFailureReason=The process
failed to exec, NSLocalizedRecoverySuggestion=Consult
/var/log/com.apple.xpc.launchd/launchd.log for more information,
NSLocalizedDescription=Unable to get valid task name port right for
pid 542}}, BSErrorCodeDescription=bootstrap-failed}
Does anybody have an idea why my app is suddenly crashing?

Answer 1

It might be happening if the developer certificate you used to create this app has been revoked or another app (still in development mode) with same bundle identifier is using your developer certificates. It happens when we build apps for testing purpose with free developer account which shares the certificate identities.

Answer 2

I had the same problem on my iPhone. It stopped working after a few days, so I checked around to see if I could find an answer. I found this, and it worked for me:
"Without enrolling in the Apple Developer Program, your app will only
last for 7 days on your device. After that, you’ll have to re-deploy
it to your device via Xcode. If you’re enrolled in the Apple Developer
Program, you won’t have this inconvenience."
I know it doesn't apply to the original question since he says he has a developer license, but it would apply to many others who don't pay for a license and if your license have expired.
I'm not sure if it's allowed to post a link to where I found the question, so just take it away if that's the case, but I do like to refer to where I got it from, when it's not me. https://codewithchris.com/deploy-your-app-on-an-iphone/