[BUG] TypeLoadException in MacCatalyst

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

In a brand new Maui project on MacCatalyst, I am getting a TypeLoadException when the program starts up. The error message says:

“Could not set up parent class, due to: Invalid generic instantiation assembly:/bin/Debug/net7.0-maccatalyst/maccatalyst-x64/SkiaSharpTest.app/Contents/MonoBundle/Microsoft.Maui.dll type:ViewHandler`2 member:(null)”

The source of the error says it is from CommunityToolkit.Maui. here is the stack trace

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

Any ideas what I can do to resolve this? It seems like this just started happening after updating to Maui 7.0.86.

Expected Behavior

No error

Steps To Reproduce

Create a new Maui Project in Visual Studio. Add CommunityToolkit.Maui nugget. Debug for MacCatalyst.

Link to public reproduction project repository

NA

Environment

- .NET MAUI CommunityToolkit: 5.0 and 5.1
- OS:MacCatalyst
- .NET MAUI: 7.0.86

Anything else?

No response

[VladislavAntonyuk]

we plan a new release tomorrow. Let’s see if it works to solve the issue.

[vhugogarcia]

Hello @gktval ,

I downloaded your brand new project where you say the error occurs, however, I was unable to reproduce it locally.

Please make sure you are using the follow app versions in macOS:

• Visual Studio Community 2022 for Mac, Version 17.5.6 (build 3)
• .NET SDK (Arm64), Versions: 7.0.302
• Xamarin.Mac, Version: 9.3.0.6
• XCode 14.3
• macOS Ventura 13.4
• Xamarin.iOS, Version: 16.4.0.6

And that you have installed the following workloads:

I ran your demo project without issues. 😃

Regards, Victor