Xamarin
A Microsoft open-source app platform for building Android and iOS apps with .NET and C#.
5,349 questions
Xamarin iOS app crashing immediately after launching
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Se
21
Reputation points
After updating XCode and Visual Studio 2019 to the latest versions, my Xamarin.Forms app shows the launch screen for about a tenth of a second, and then crashes when running on an iPhone (the simulator still works fine).
Looking at the device log, I am seeing this error when the crash happens:
Tag: kernel(AppleMobileFileIntegrity)
Message: Library Validation failed: Rejecting '/private/var/containers/Bundle/Application/.../MyAppiOS.app/libMyAppiOS.exe.dylib' (Team ID: none, platform: no) for process 'MyAppiOS(506)' (Team ID: ABC123XYZ, platform: no), reason: mapped file has no cdhash, completely unsigned? Code has to be at least ad-hoc signed
Visual Studio Enterprise 16.10.3
Xamarin.iOS SDK 14.20.0.24
Any help would be appreciated. I haven't added any new third party libraries before this error began.
{count} votes
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Wenyan Zhang (Shanghai Wicresoft Co,.Ltd.) 31,166 Reputation points Microsoft Vendor2021-07-19T05:29:02.82+00:00 It seems that dylib needs to be signed. Do you use VS on Windows or on Mac? You can refer to https://learn.microsoft.com/en-us/answers/questions/468120/ios-app-crashes-immediately-after-debug-start.html?sort=oldest, maybe it's a similar issue.
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Se 21 Reputation points
2021-07-20T00:16:36.177+00:00 I use VS on Windows. And since I could not get the app to run successfully no matter what I tried (rebooting PC/Mac, cleaning solution, deleting bin/obj folders, etc.), my only option was to downgrade Visual Studio & Xcode (the problem was happening on XCode 12.5 & VS 16.10). The problem is not happening when using XCode 12.1 and VS 16.7, which I am currently using now. I am guessing the issue might be with XCode 12.5, based on other researching/Googling this problem.
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Wenyan Zhang (Shanghai Wicresoft Co,.Ltd.) 31,166 Reputation points Microsoft Vendor
2021-07-20T02:52:14.217+00:00 This may be a potential issue of updating. It's suggested to report the issue via Visual Studio's 'Report a Problem' menu and then follow them on the developer community site. Please see How to report a problem with Visual Studio - Visual Studio | Microsoft Learn. Thank you for your sharing again.
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