Xamarin Forms iOS project runs in simulator but not in device

Question

I have an app published in App Store and I have not modified any code. Actually before modifying code I wanted to run it once. It ran well in iPhone Xr simulator. No issues. But when I tried to run on my iPhone 6 it was crashing after the load. No messages. Nothing in Output window. Debug or Release nothing works. Deleted bin & obj folders and rebuilt the project but in vain.

Is it that iPhone 6 running iOS 12.x and the Xcode 12.5.1 not compatible? I was trying from VS 2019 ver 16.10.3.

As per this StackOverflow thread I checked and every code behind had XamlCompilation attribute set at the beginning of the code.

Answer 1

Hello,
Welcome to our Microsoft Q&A platform!
There is a similar issue. It caused by incremental builds, you can try to close incremental builds. For more information you can refer to
https://stackoverflow.com/questions/68101464/xamarin-ios-app-crashing-with-error-dyld-library-not-loaded-mapped-file-has-no

Best Regards,
Wenyan Zhang

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Answer 2

@Wenyan Zhang (Shanghai Wicresoft Co,.Ltd.) Here is the screenshot of the device log fetched from Xcode.

iOS Build and iOS Bundle Signing tabs of the iOS Project Properties are shown below.

I don't find any issue with these settings as they are similar to other projects under development.

But one thing is noted: Though I don't have another iPhone readily available to test, I get the issue with only the app that has been published to App Store. I have only one app published. All other apps that are not published are running find in my iPhone 6.