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

[KieranMaclagan]

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

1. 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

[TheCodeTraveler]

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]

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

[TheCodeTraveler]

Thanks for following up!

[marcojak]

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

[vhugogarcia]

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]

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]

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]

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

[ne0rrmatrix]

{
  "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?