"Apply" method Exception on start-up when using umbraco 17 RC.

[WEBhicham]

Describe the bug
After upgrading an existing Umbraco 16 website to Umbraco 17 RC, the application fails to start. uSync throws a System.TypeLoadException indicating a missing method implementation in the uSyncClientOperationSecurityFilter class.

Exception Message:

System.TypeLoadException: Method 'Apply' in type 'uSync.Backoffice.Management.Api.Configuration.uSyncClientOperationSecurityFilter' from assembly 'uSync.Backoffice.Management.Api, Version=17.0.0.0, Culture=neutral, PublicKeyToken=null' does not have an implementation.

To Reproduce

1. Start with an existing solution running Umbraco 16.3.4.
2. Upgrade the project references to Umbraco 17.0.0-rc3.
3. Upgrade the uSync package from version 16.1.0 to 17.0.0-rc3.
4. Build and run the project.

Expected behavior
The application should build and boot up successfully without throwing runtime exceptions.

Screenshots

About your Site (please complete the following information):

• Umbraco Version: 17.0.0-rc3
• uSync Version: 17.0.0-rc3
• Browser: Zen Browser

Additional context

• This issue does not occur on a clean installation of Umbraco 17.0.0-rc3; it appears specific to the upgrade path from v16.
• I attempted to rule out configuration issues by replacing my Program.cs with the default file from a fresh v17 install, but the error persists.
• The stack trace does not reference any user-land code (my project files), making it difficult to pinpoint the conflict.

Stacktrace

Unhandled exception. System.Reflection.ReflectionTypeLoadException: Could not load all types from "uSync.Backoffice.Management.Api, Version=17.0.0.0, Culture=neutral, PublicKeyToken=null" due to LoaderExceptions, skipping:
. System.TypeLoadException on uSync.Backoffice.Management.Api.Configuration.uSyncClientOperationSecurityFilter: Method 'Apply' in type 'uSync.Backoffice.Management.Api.Configuration.uSyncClientOperationSecurityFilter' from assembly 'uSync.Backoffice.Management.Api, Version=17.0.0.0, Culture=neutral, PublicKeyToken=null' does not have an implementation.

Method 'Apply' in type 'uSync.Backoffice.Management.Api.Configuration.uSyncClientOperationSecurityFilter' from assembly 'uSync.Backoffice.Management.Api, Version=17.0.0.0, Culture=neutral, PublicKeyToken=null' does not have an implementation.
   at Umbraco.Cms.Core.Composing.TypeFinder.GetTypesWithFormattedException(Assembly a)
   at Umbraco.Cms.Core.Composing.TypeFinder.GetClassesWithBaseType(Type baseType, IEnumerable`1 assemblies, Boolean onlyConcreteClasses, Func`2 additionalFilter)
   at Umbraco.Cms.Core.Composing.TypeFinder.FindClassesOfType(Type assignTypeFrom, IEnumerable`1 assemblies, Boolean onlyConcreteClasses)
   at Umbraco.Extensions.TypeFinderExtensions.FindClassesOfType[T](ITypeFinder typeFinder, IEnumerable`1 assemblies, Boolean onlyConcreteClasses)
   at Umbraco.Cms.Core.Composing.TypeLoader.<>c__DisplayClass13_0`1.<GetTypes>b__1()
   at Umbraco.Cms.Core.Composing.TypeLoader.GetTypesInternalLocked(Type baseType, Type attributeType, Func`1 finder, String action, Boolean cache)
   at Umbraco.Cms.Core.Composing.TypeLoader.GetTypesInternal(Type baseType, Type attributeType, Func`1 finder, String action, Boolean cache)
   at Umbraco.Cms.Core.Composing.TypeLoader.GetTypes[T](Boolean cache, IEnumerable`1 specificAssemblies)
   at Umbraco.Cms.Core.DependencyInjection.UmbracoBuilderExtensions.AddAllCoreCollectionBuilders(IUmbracoBuilder builder)
   at Umbraco.Cms.Core.DependencyInjection.UmbracoBuilder.AddCoreServices()
   at Umbraco.Cms.Core.DependencyInjection.UmbracoBuilder..ctor(IServiceCollection services, IConfiguration config, TypeLoader typeLoader, ILoggerFactory loggerFactory, IProfiler profiler, AppCaches appCaches)
   at Umbraco.Extensions.UmbracoBuilderExtensions.AddUmbraco(IServiceCollection services, IWebHostEnvironment webHostEnvironment, IConfiguration config)
   at Umbraco.Extensions.WebApplicationBuilderExtensions.CreateUmbracoBuilder(WebApplicationBuilder builder)
   at Program.<Main>$(String[] args) in C:\Users\XXXXXXXXXXXXXXXXX\Program.cs:line 3
   at Program.<Main>(String[] args)
System.TypeLoadException: Method 'Apply' in type 'uSync.Backoffice.Management.Api.Configuration.uSyncClientOperationSecurityFilter' from assembly 'uSync.Backoffice.Management.Api, Version=17.0.0.0, Culture=neutral, PublicKeyToken=null' does not have an implementation.

[KevinJump]

Hi,

Yeah this is an issue if you're project has a dependency on a higher version of Swashbuckle.AspNetCore 10.x as there are breaking changes in it :(

Umbraco's internal dependency is still 9.0.6 and so uSync's is also set to this version (we can't actually build against v10, while umbraco is at v9. the changes are to breaking in the Swashbuckle library)

if you remove uSync, you will probably still get an error just on another thing, because its true for all management api endpoints.

we have an issue about it, here #854 but its not something we can fix until the core moves to 9.0.6

[KevinJump]

edit: Monitoring this discussion umbraco/Umbraco-CMS#20902

[WEBhicham]

I reverted the Microsoft.AspNetCore.OpenApi package back to version 9.0.11 and that does indeed fix the error! Thanks for the heads-up.

You are welcome to close this issue! I'll keep my eye on the Umbraco discussion.

[KevinJump]

Pinning it for now, hopefully to point people in the right direction.

[bielu]

@KevinJump i guess this one needs update as Umbraco decided to use v10 of swashbuckle, so people should use latest version of Microsoft.AspNetCore.OpenApi & swashbuckle :)

[KevinJump]

Yes, #864 already done and waiting for the actual RC4 to appear on nuget