[BUG] Could not set up parent class, due to: Invalid generic instantiation #1075

KieranMaclagan · 2023-03-08T16:22:07Z

Is there an existing issue for this?

I have searched the existing issues

Did you read the "Reporting a bug" section on Contributing file?

I have read the "Reporting a bug" section on Contributing file: https://github.com/CommunityToolkit/Maui/blob/main/CONTRIBUTING.md#reporting-a-bug

Current Behavior

Attempting to debug on a physical iOS device from crashes on startup with System.TypeLoadException Could not set up parent class, due to: Invalid generic instantiation.

Expected Behavior

App does not crash on start up.

Steps To Reproduce

Debug run sample app on physical device

Link to public reproduction project repository

https://github.com/KieranMaclagan/MCTAppBuilderExtensionsTest

Environment

- .NET MAUI CommunityToolkit: 5.0.0
- OS: macOS Ventura 13.2.1
- .NET MAUI: 7.0.49
- VS Mac: 17.5.1
- Device: iPhone 8, iOS 16.3.1

Anything else?

CommunityToolkit.Maui 4.0.0 does experience this

CommunityToolkit.Maui 3.1.0 does not experience this

Stack Trace:

at CommunityToolkit.Maui.AppBuilderExtensions.<>c.b__0_0(IMauiHandlersCollection h) in /_/src/CommunityToolkit.Maui/AppBuilderExtensions.shared.cs:line 28
at Microsoft.Maui.Hosting.HandlerMauiAppBuilderExtensions.HandlerRegistration.AddRegistration(IMauiHandlersCollection builder)
at Microsoft.Maui.Hosting.Internal.MauiHandlersFactory.CreateHandlerCollection(IEnumerable1 registrationActions) at Microsoft.Maui.Hosting.Internal.MauiHandlersFactory..ctor(IEnumerable1 registrationActions)
at Microsoft.Maui.Hosting.HandlerMauiAppBuilderExtensions.<>c.b__1_0(IServiceProvider sp)
at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitFactory(FactoryCallSite factoryCallSite, RuntimeResolverContext context)
at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor2[[Microsoft.Extensions.DependencyInjection.ServiceLookup.RuntimeResolverContext, Microsoft.Extensions.DependencyInjection, Version=7.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60],[System.Object, System.Private.CoreLib, Version=7.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].VisitCallSiteMain(ServiceCallSite callSite, RuntimeResolverContext argument) at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitRootCache(ServiceCallSite callSite, RuntimeResolverContext context) at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor2[[Microsoft.Extensions.DependencyInjection.ServiceLookup.RuntimeResolverContext, Microsoft.Extensions.DependencyInjection, Version=7.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60],[System.Object, System.Private.CoreLib, Version=7.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].VisitCallSite(ServiceCallSite callSite, RuntimeResolverContext argument)
at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.Resolve(ServiceCallSite callSite, ServiceProviderEngineScope scope)
at Microsoft.Extensions.DependencyInjection.ServiceProvider.CreateServiceAccessor(Type serviceType)
at System.Collections.Concurrent.ConcurrentDictionary2[[System.Type, System.Private.CoreLib, Version=7.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.Func2[[Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngineScope, Microsoft.Extensions.DependencyInjection, Version=7.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60],[System.Object, System.Private.CoreLib, Version=7.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], System.Private.CoreLib, Version=7.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].GetOrAdd(Type key, Func2 valueFactory) at Microsoft.Extensions.DependencyInjection.ServiceProvider.GetService(Type serviceType, ServiceProviderEngineScope serviceProviderEngineScope) at Microsoft.Extensions.DependencyInjection.ServiceProvider.GetService(Type serviceType) at Microsoft.Maui.MauiContext.WrappedServiceProvider.GetService(Type serviceType) at Microsoft.Maui.MauiContext.WrappedServiceProvider.GetService(Type serviceType) at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService(IServiceProvider provider, Type serviceType) at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService[IMauiHandlersFactory](IServiceProvider provider) at Microsoft.Maui.MauiContext.<.ctor>b__2_0() at System.Lazy1[[Microsoft.Maui.IMauiHandlersFactory, Microsoft.Maui, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].ViaFactory(LazyThreadSafetyMode mode)
at System.Lazy1[[Microsoft.Maui.IMauiHandlersFactory, Microsoft.Maui, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].ExecutionAndPublication(LazyHelper executionAndPublication, Boolean useDefaultConstructor) at System.Lazy1[[Microsoft.Maui.IMauiHandlersFactory, Microsoft.Maui, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].CreateValue()
at System.Lazy`1[[Microsoft.Maui.IMauiHandlersFactory, Microsoft.Maui, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].get_Value()
at Microsoft.Maui.MauiContext.get_Handlers()
at Microsoft.Maui.Platform.ElementExtensions.SetHandler(INativeObject nativeElement, IElement element, IMauiContext context)
at Microsoft.Maui.Platform.ElementExtensions.SetApplicationHandler(IUIApplicationDelegate platformApplication, IApplication application, IMauiContext context)
at Microsoft.Maui.MauiUIApplicationDelegate.FinishedLaunching(UIApplication application, NSDictionary launchOptions)
at UIKit.UIApplication.UIApplicationMain(Int32 argc, String[] argv, IntPtr principalClassName, IntPtr delegateClassName)
at UIKit.UIApplication.Main(String[] args, Type principalClass, Type delegateClass)
at MCTAppBuilderExtensionsTest.Program.Main(String[] args) in /Users/kmaclagan/Projects/MCTAppBuilderExtensionsTest/MCTAppBuilderExtensionsTest/Platforms/iOS/Program.cs:line 13

The text was updated successfully, but these errors were encountered:

TheCodeTraveler · 2023-03-08T16:31:35Z

Do you get an error when using .NET MAUI v7.0.59?

CommunityToolkit.Maui v5.0.0 only supports .NET MAUI v7.0.59. See the release notes for more details: https://github.com/CommunityToolkit/Maui/releases/tag/5.0.0

KieranMaclagan · 2023-03-08T16:39:48Z

Thanks @brminnick, my bad. Updated my desktop but not mac. .NET MAUI v7.0.59 works.

TheCodeTraveler · 2023-03-08T17:00:36Z

Thanks for following up!

marcojak · 2024-08-27T18:12:25Z

I think the issue is present again.
I get the same error with the latest version of the plugin and .Net and MAUI

vhugogarcia · 2024-08-28T13:55:10Z

Thanks @marcojak for sharing feedback.

The issue is in fact present again. I'm unsure the root cause, it will require further investigation. I also ran some tests today and I faced the same issue after updating to 9.0.3.

As a quick workaround:
Downgrade to 9.02, then delete the bin/obj folders and rebuild again.

thomasgalliker · 2024-09-30T09:08:05Z

Same here. CommunityToolkit.Maui version 9.1.0 does not work on physical iPhone devices. I crashes at app startup.

2024-09-30 08:55:36.3173|Error|TestApp.AppDelegate|CurrentDomain_UnhandledException|System.TypeLoadException: Could not set up parent class, due to: Invalid generic instantiation assembly:/private/var/containers/Bundle/Application/B418A6D4-8C4F-4041-BB7B-D42724973C86/TestApp.app/Microsoft.Maui.dll type:ViewHandler`2 member:(null)
   at CommunityToolkit.Maui.AppBuilderExtensions.<>c.<UseMauiCommunityToolkit>b__0_0(IMauiHandlersCollection h)
   at Microsoft.Maui.Hosting.HandlerMauiAppBuilderExtensions.HandlerRegistration.AddRegistration(IMauiHandlersCollection builder)
   at Microsoft.Maui.Hosting.Internal.MauiHandlersFactory.CreateHandlerCollection(IEnumerable`1 registrationActions)
   at Microsoft.Maui.Hosting.Internal.MauiHandlersFactory..ctor(IEnumerable`1 registrationActions)
   at Microsoft.Maui.Hosting.HandlerMauiAppBuilderExtensions.<>c.<ConfigureMauiHandlers>b__1_0(IServiceProvider sp)
   at DryIoc.Registrator.ToFactoryDelegate[Object](Func`2 f, IResolverContext r) in /_/src/DryIoc/Container.cs:line 8047
   at DryIoc.Interpreter.TryInterpret(IResolverContext r, Expression expr, IParameterProvider paramExprs, Object paramValues, ParentLambdaArgs parentArgs, Object& result) in /_/src/DryIoc/Container.cs:line 3269
   at DryIoc.Interpreter.TryInterpretSingletonAndUnwrapContainerException(IResolverContext r, Expression expr, ImMapEntry`1 itemRef, Object& result) in /_/src/DryIoc/Container.cs:line 3105
   at DryIoc.Factory.ApplyReuse(Expression serviceExpr, Request request) in /_/src/DryIoc/Container.cs:line 11136
   at DryIoc.Factory.GetExpressionOrDefault(Request request) in /_/src/DryIoc/Container.cs:line 11055
   at DryIoc.Container.ResolveAndCache(Int32 serviceTypeHash, Type serviceType, IfUnresolved ifUnresolved) in /_/src/DryIoc/Container.cs:line 426
   at DryIoc.Container.System.IServiceProvider.GetService(Type serviceType) in /_/src/DryIoc/Container.cs:line 344
   at Microsoft.Maui.MauiContext.WrappedServiceProvider.GetService(Type serviceType)
   at Microsoft.Maui.MauiContext.WrappedServiceProvider.GetService(Type serviceType)
   at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService(IServiceProvider provider, Type serviceType)
   at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService[IMauiHandlersFactory](IServiceProvider provider)
   at Microsoft.Maui.MauiContext.<.ctor>b__2_0()
   at System.Lazy`1[[Microsoft.Maui.IMauiHandlersFactory, Microsoft.Maui, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].ViaFactory(LazyThreadSafetyMode mode)
   at System.Lazy`1[[Microsoft.Maui.IMauiHandlersFactory, Microsoft.Maui, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].ExecutionAndPublication(LazyHelper executionAndPublication, Boolean useDefaultConstructor)
   at System.Lazy`1[[Microsoft.Maui.IMauiHandlersFactory, Microsoft.Maui, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].CreateValue()
   at System.Lazy`1[[Microsoft.Maui.IMauiHandlersFactory, Microsoft.Maui, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].get_Value()
   at Microsoft.Maui.MauiContext.get_Handlers()
   at Microsoft.Maui.Platform.ElementExtensions.SetHandler(INativeObject nativeElement, IElement element, IMauiContext context)
   at Microsoft.Maui.Platform.ElementExtensions.SetApplicationHandler(IUIApplicationDelegate platformApplication, IApplication application, IMauiContext context)
   at Microsoft.Maui.MauiUIApplicationDelegate.FinishedLaunching(UIApplication application, NSDictionary launchOptions)
   at TestApp.AppDelegate.FinishedLaunching(UIApplication app, NSDictionary launchOptions) in /Users/user/src/gitlab/TestApp/Platforms/iOS/AppDelegate.cs:line 49
   at UIKit.UIApplication.UIApplicationMain(Int32 argc, String[] argv, IntPtr principalClassName, IntPtr delegateClassName) in /Users/builder/azdo/_work/1/s/xamarin-macios/src/UIKit/UIApplication.cs:line 61
   at UIKit.UIApplication.Main(String[] args, Type principalClass, Type delegateClass) in /Users/builder/azdo/_work/1/s/xamarin-macios/src/UIKit/UIApplication.cs:line 96
   at TestApp.Program.Main(String[] args) in /Users/user/src/gitlab/TestApp/Platforms/iOS/Program.cs:line 13[EOL]

tylerwilson · 2024-09-30T18:26:50Z

Same issue as @thomasgalliker with Toolkit 9.1.0 when trying to run MacCatalyst target. Going back to 9.0.3 and cleaning is okay.

bijington · 2024-09-30T18:29:14Z

Why are we seeing this? Is there something that is being built and causing a dependency on later versions of MAUI or workloads?

ne0rrmatrix · 2024-09-30T19:14:51Z

{
  "sdk": {
    "version": "8.0.303",
    "rollForward": "latestFeature",
    "allowPrerelease": false
  }
}

Current listed version on dotnet 8.x downloads site shows 8.0.402 as current SDK release. It is possible that the global.json file is out of date?

TheCodeTraveler · 2024-09-30T19:27:05Z

Why are we seeing this?

It's most likely a problem with the Trimmer and/or the Linker.

You can disable Trimming by setting this value in the CSPROJ:

<PublishTrimmed>true</PublishTrimmed>

https://learn.microsoft.com/en-us/dotnet/core/deploying/trimming/trimming-options?pivots=dotnet-8-0#enable-trimming

You can disable the Linker by following these docs: https://learn.microsoft.com/en-us/dotnet/maui/ios/linking?view=net-maui-8.0

ricardommatias · 2024-10-01T19:07:16Z

Same issue as @thomasgalliker with Toolkit 9.1.0 when trying to run MacCatalyst target. Going back to 9.0.3 and cleaning is okay.

Also happens with MediaElement 4.1.1. Reverting to 4.1.0 fixes the issue

julianadormon · 2024-10-05T19:38:37Z

Same. I do not get the error is I downgrade 9.0.3.

System.TypeLoadException: Could not set up parent class, due to: Field 'k__BackingField' is an invalid generic instantiation of type System.Func2[Microsoft.Maui.Handlers.ViewHandler2[CommunityToolkit.Maui.Core.IDrawingView,System.Object],System.Object] assembly:/Users/macminim1/Projects/Proofpix-V2/ProofpixAdmin/ProofpixAdmin/bin/Debug/net9.0-maccatalyst/maccatalyst-arm64/ProofpixAdmin.app/Contents/MonoBundle/Microsoft.Maui.dll type:ViewHandler2 member:(null) at CommunityToolkit.Maui.AppBuilderExtensions.<>c.<UseMauiCommunityToolkit>b__0_0(IMauiHandlersCollection h) at Microsoft.Maui.Hosting.HandlerMauiAppBuilderExtensions.HandlerRegistration.AddRegistration(IMauiHandlersCollection builder) at Microsoft.Maui.Hosting.HandlerMauiAppBuilderExtensions.HandlerServiceBuilder..ctor(IEnumerable1 registrationActions)
at Microsoft.Maui.Hosting.HandlerMauiAppBuilderExtensions.<>c.b__1_1(IServiceProvider sp)
at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitFactory(FactoryCallSite factoryCallSite, RuntimeResolverContext context)
at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor2[[Microsoft.Extensions.DependencyInjection.ServiceLookup.RuntimeResolverContext, Microsoft.Extensions.DependencyInjection, Version=9.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60],[System.Object, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].VisitCallSiteMain(ServiceCallSite callSite, RuntimeResolverContext argument) at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitRootCache(ServiceCallSite callSite, RuntimeResolverContext context) at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor2[[Microsoft.Extensions.DependencyInjection.ServiceLookup.RuntimeResolverContext, Microsoft.Extensions.DependencyInjection, Version=9.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60],[System.Object, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].VisitCallSite(ServiceCallSite callSite, RuntimeResolverContext argument)
at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.Resolve(ServiceCallSite callSite, ServiceProviderEngineScope scope)
at Microsoft.Extensions.DependencyInjection.ServiceProvider.CreateServiceAccessor(ServiceIdentifier serviceIdentifier)
at System.Collections.Concurrent.ConcurrentDictionary2[[Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceIdentifier, Microsoft.Extensions.DependencyInjection, Version=9.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60],[Microsoft.Extensions.DependencyInjection.ServiceProvider.ServiceAccessor, Microsoft.Extensions.DependencyInjection, Version=9.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]].GetOrAdd(ServiceIdentifier key, Func2 valueFactory)
at Microsoft.Extensions.DependencyInjection.ServiceProvider.GetService(ServiceIdentifier serviceIdentifier, ServiceProviderEngineScope serviceProviderEngineScope)
at Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngineScope.GetService(Type serviceType)
at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService(IServiceProvider provider, Type serviceType)
at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService[IMauiHandlersCollection](IServiceProvider provider)
at Microsoft.Maui.Hosting.HandlerMauiAppBuilderExtensions.<>c.b__1_0(IServiceProvider sp)
at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitFactory(FactoryCallSite factoryCallSite, RuntimeResolverContext context)
at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor2[[Microsoft.Extensions.DependencyInjection.ServiceLookup.RuntimeResolverContext, Microsoft.Extensions.DependencyInjection, Version=9.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60],[System.Object, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].VisitCallSiteMain(ServiceCallSite callSite, RuntimeResolverContext argument) at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitRootCache(ServiceCallSite callSite, RuntimeResolverContext context) at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor2[[Microsoft.Extensions.DependencyInjection.ServiceLookup.RuntimeResolverContext, Microsoft.Extensions.DependencyInjection, Version=9.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60],[System.Object, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].VisitCallSite(ServiceCallSite callSite, RuntimeResolverContext argument)
at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.Resolve(ServiceCallSite callSite, ServiceProviderEngineScope scope)
at Microsoft.Extensions.DependencyInjection.ServiceProvider.CreateServiceAccessor(ServiceIdentifier serviceIdentifier)
at System.Collections.Concurrent.ConcurrentDictionary2[[Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceIdentifier, Microsoft.Extensions.DependencyInjection, Version=9.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60],[Microsoft.Extensions.DependencyInjection.ServiceProvider.ServiceAccessor, Microsoft.Extensions.DependencyInjection, Version=9.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]].GetOrAdd(ServiceIdentifier key, Func2 valueFactory)
at Microsoft.Extensions.DependencyInjection.ServiceProvider.GetService(ServiceIdentifier serviceIdentifier, ServiceProviderEngineScope serviceProviderEngineScope)
at Microsoft.Extensions.DependencyInjection.ServiceProvider.GetService(Type serviceType)
at Microsoft.Maui.MauiContext.WrappedServiceProvider.GetService(Type serviceType)
at Microsoft.Maui.MauiContext.WrappedServiceProvider.GetService(Type serviceType)
at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService(IServiceProvider provider, Type serviceType)
at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService[IMauiHandlersFactory](IServiceProvider provider)
at Microsoft.Maui.MauiContext.<.ctor>b__2_0()
at System.Lazy1[[Microsoft.Maui.IMauiHandlersFactory, Microsoft.Maui, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].ViaFactory(LazyThreadSafetyMode mode) at System.Lazy1[[Microsoft.Maui.IMauiHandlersFactory, Microsoft.Maui, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].ExecutionAndPublication(LazyHelper executionAndPublication, Boolean useDefaultConstructor)
at System.Lazy1[[Microsoft.Maui.IMauiHandlersFactory, Microsoft.Maui, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].CreateValue() at System.Lazy1[[Microsoft.Maui.IMauiHandlersFactory, Microsoft.Maui, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].get_Value()
at Microsoft.Maui.MauiContext.get_Handlers()
at Microsoft.Maui.Platform.ElementExtensions.SetHandler(INativeObject nativeElement, IElement element, IMauiContext context)
at Microsoft.Maui.Platform.ElementExtensions.SetApplicationHandler(IUIApplicationDelegate platformApplication, IApplication application, IMauiContext context)
at Microsoft.Maui.MauiUIApplicationDelegate.FinishedLaunching(UIApplication application, NSDictionary launchOptions)
at UIKit.UIApplication.UIApplicationMain(Int32 argc, String[] argv, IntPtr principalClassName, IntPtr delegateClassName) in /Users/builder/azdo/_work/1/s/xamarin-macios/src/UIKit/UIApplication.cs:line 61
at UIKit.UIApplication.Main(String[] args, Type principalClass, Type delegateClass) in /Users/builder/azdo/_work/1/s/xamarin-macios/src/UIKit/UIApplication.cs:line 96
at ProofpixAdmin.Program.Main(String[] args) in /Users/macminim1/Projects/Proofpix-V2/ProofpixAdmin/ProofpixAdmin/Platforms/MacCatalyst/Program.cs:line 13

DennisWelu · 2024-10-07T15:52:09Z

Why are we seeing this?

It's most likely a problem with the Trimmer and/or the Linker.

You can disable Trimming by setting this value in the CSPROJ:
<PublishTrimmed>true</PublishTrimmed>
https://learn.microsoft.com/en-us/dotnet/core/deploying/trimming/trimming-options?pivots=dotnet-8-0#enable-trimming

You can disable the Linker by following these docs: https://learn.microsoft.com/en-us/dotnet/maui/ios/linking?view=net-maui-8.0

@brminnick I wanted to test this suggestion, so I added false to the csproj. Since I am seeing this issue building the debug configuration, I was assuming that linking/trimming was already disabled but though well maybe... But after adding the setting I got this in the build output:

1>Xamarin.Shared.Sdk.targets(303,3): Error : iOS projects must build with PublishTrimmed=true. Current value: false. Set 'MtouchLink=None' instead to disable trimming for all assemblies.

So...I tried doing what the message says to do instead. It built, but that didn't seem to help with the reported issue.

bijington · 2024-10-07T16:53:07Z

@DennisWelu enwe are working on a fix here: #2243

TheCodeTraveler · 2024-10-07T20:28:19Z

Hey gang! I'm closing this issue because it has since spawned into folks hitting multiple different Issues, assuming it is the same problem Kieren identified in his initial issue.

@KieranMaclagan confirmed his specific Issue was fixed by installing the latest version of .NET MAUI.

Please open a new Issue for the other problems reported in this thread.

KieranMaclagan added bug Something isn't working unverified labels Mar 8, 2023

KieranMaclagan closed this as completed Mar 8, 2023

gktval mentioned this issue May 23, 2023

[BUG] TypeLoadException in MacCatalyst #1195

Closed

2 tasks

vhugogarcia reopened this Aug 28, 2024

vhugogarcia removed the unverified label Aug 28, 2024

bijington mentioned this issue Oct 1, 2024

Make use of a specific iOS + MacCatalyst TFM #2243

Closed

6 tasks

TheCodeTraveler closed this as completed Oct 7, 2024

CommunityToolkit locked as resolved and limited conversation to collaborators Oct 7, 2024

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[BUG] Could not set up parent class, due to: Invalid generic instantiation #1075

[BUG] Could not set up parent class, due to: Invalid generic instantiation #1075

KieranMaclagan commented Mar 8, 2023

TheCodeTraveler commented Mar 8, 2023

KieranMaclagan commented Mar 8, 2023

TheCodeTraveler commented Mar 8, 2023

marcojak commented Aug 27, 2024

vhugogarcia commented Aug 28, 2024

thomasgalliker commented Sep 30, 2024

tylerwilson commented Sep 30, 2024

bijington commented Sep 30, 2024

ne0rrmatrix commented Sep 30, 2024 •

edited

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TheCodeTraveler commented Sep 30, 2024

ricardommatias commented Oct 1, 2024

julianadormon commented Oct 5, 2024 •

edited

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DennisWelu commented Oct 7, 2024

bijington commented Oct 7, 2024

TheCodeTraveler commented Oct 7, 2024 •

edited

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[BUG] Could not set up parent class, due to: Invalid generic instantiation #1075

[BUG] Could not set up parent class, due to: Invalid generic instantiation #1075

Comments

KieranMaclagan commented Mar 8, 2023

Is there an existing issue for this?

Did you read the "Reporting a bug" section on Contributing file?

Current Behavior

Expected Behavior

Steps To Reproduce

Link to public reproduction project repository

Environment

Anything else?

TheCodeTraveler commented Mar 8, 2023

KieranMaclagan commented Mar 8, 2023

TheCodeTraveler commented Mar 8, 2023

marcojak commented Aug 27, 2024

vhugogarcia commented Aug 28, 2024

thomasgalliker commented Sep 30, 2024

tylerwilson commented Sep 30, 2024

bijington commented Sep 30, 2024

ne0rrmatrix commented Sep 30, 2024 • edited Loading

TheCodeTraveler commented Sep 30, 2024

ricardommatias commented Oct 1, 2024

julianadormon commented Oct 5, 2024 • edited Loading

DennisWelu commented Oct 7, 2024

bijington commented Oct 7, 2024

TheCodeTraveler commented Oct 7, 2024 • edited Loading

ne0rrmatrix commented Sep 30, 2024 •

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julianadormon commented Oct 5, 2024 •

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TheCodeTraveler commented Oct 7, 2024 •

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