Mismatch between the .NET version used by the VS extension and the .NET Framework version of the test project.

[A95535]

Used Visual Studio

Visual Studio 2022

Are the latest Visual Studio updates installed?

Yes

Content of reqnroll.json (if present)

### This is Error we got after build a project

Info: OnActivityStarted: Starting Visual Studio Extension...
Info: CreateProjectScope: Initializing project: Kiwa.Dataverse.Plugins.Tests
Info: StartRetryInitializeTimer: Project settings not available yet, retry in 5 seconds...
Info: OnSettingsInitialized: Project settings initialized: .NETFramework,Version=v4.6.2,SpecFlow:3.9.74
Warning: AndDiscoveryProviderSucceed: Error during binding discovery. 
Command executed:
  C:\Users\AnushaOruganti\source\repos\D365CE\Main\Kiwa.Dataverse.Plugins.Tests\bin\Debug\net462> C:\Program Files\dotnet\dotnet.exe exec c:\users\anushaoruganti\appdata\local\microsoft\visualstudio\17.0_29dec9ce\extensions\yok2auca.1z0\Connectors\SpecFlow-Generic-net8.0\specflow-vs.dll discovery C:\Users\AnushaOruganti\source\repos\D365CE\Main\Kiwa.Dataverse.Plugins.Tests\bin\Debug\net462\Kiwa.Dataverse.Plugins.Tests.dll C:\Users\AnushaOruganti\source\repos\D365CE\Main\Kiwa.Dataverse.Plugins.Tests\App.config
Exit code: 0
Message: 
System.TypeLoadException: Could not load type 'System.Xml.XmlNode' from assembly 'System.Xml.ReaderWriter, Version=4.1.1.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'.
   at SpecFlowConnector.SpecFlowProxies.SpecFlowConfigurationLoader.<>c__DisplayClass2_0.<Load>b__0(FileDetails configFile)
   at Some`1.Map[TResult](Func`2 map)
   at SpecFlowConnector.SpecFlowProxies.SpecFlowConfigurationLoader.Load(SpecFlowConfiguration specFlowConfiguration)
   at TechTalk.SpecFlow.Configuration.DefaultRuntimeConfigurationProvider.LoadConfiguration(SpecFlowConfiguration specFlowConfiguration)
   at TechTalk.SpecFlow.Infrastructure.ContainerBuilder.CreateGlobalContainer(Assembly testAssembly, IRuntimeConfigurationProvider configurationProvider)
   at SpecFlowConnector.SpecFlowProxies.BindingRegistryFactoryVLatest.CreateObjectContainer(Assembly testAssembly, ContainerBuilder containerBuilder, IRuntimeConfigurationProvider configurationProvider, IDefaultDependencyProvider dependencyProvider)
   at SpecFlowConnector.SpecFlowProxies.BindingRegistryFactoryVLatest.CreateObjectContainer(Assembly testAssembly, Object containerBuilder, IRuntimeConfigurationProvider configurationProvider, Object dependencyProvider)
   at SpecFlowConnector.SpecFlowProxies.BindingRegistryFactory.<>c__DisplayClass2_0.<GetBindingRegistry>b__0(Object dependencyProvider)
   at FunctionalExtensions.Map[TSource,TResult](TSource this, Func`2 fn)
   at SpecFlowConnector.SpecFlowProxies.BindingRegistryFactory.GetBindingRegistry(AssemblyLoadContext assemblyLoadContext, Assembly testAssembly, Option`1 configFile)
   at SpecFlowConnector.Discovery.SpecFlowDiscoverer.Discover(IBindingRegistryFactory bindingRegistryFactory, AssemblyLoadContext assemblyLoadContext, Assembly testAssembly, Option`1 configFile)
   at SpecFlowConnector.Discovery.DiscoveryCommand.<>c__DisplayClass6_0.<Execute>b__0(IBindingRegistryFactory bindingRegistryFactory)
   at FunctionalExtensions.Map[TSource,TResult](TSource this, Func`2 fn)
   at SpecFlowConnector.Discovery.DiscoveryCommand.Execute(AssemblyLoadContext assemblyLoadContext)
   at SpecFlowConnector.ReflectionExecutor.<>c__DisplayClass3_0.<Execute>b__6(DiscoveryCommand cmd)
   at FunctionalExtensions.Map[TSource,TResult](TSource this, Func`2 fn)
   at SpecFlowConnector.ReflectionExecutor.<>c__DisplayClass3_1.<Execute>b__2()
   at EitherAdapters.Try[T](Func`1 act)
Info Found V3.9.74.14555 at C:\Users\AnushaOruganti\source\repos\D365CE\Main\Kiwa.Dataverse.Plugins.Tests\bin\Debug\net462\TechTalk.SpecFlow.dll
Info Chosen BindingRegistryFactoryBeforeV310000 for 309074
Error System.TypeLoadException: Could not load type 'System.Xml.XmlNode' from assembly 'System.Xml.ReaderWriter, Version=4.1.1.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'.
   at SpecFlowConnector.SpecFlowProxies.SpecFlowConfigurationLoader.<>c__DisplayClass2_0.<Load>b__0(FileDetails configFile)
   at Some`1.Map[TResult](Func`2 map)
   at SpecFlowConnector.SpecFlowProxies.SpecFlowConfigurationLoader.Load(SpecFlowConfiguration specFlowConfiguration)
   at TechTalk.SpecFlow.Configuration.DefaultRuntimeConfigurationProvider.LoadConfiguration(SpecFlowConfiguration specFlowConfiguration)
   at TechTalk.SpecFlow.Infrastructure.ContainerBuilder.CreateGlobalContainer(Assembly testAssembly, IRuntimeConfigurationProvider configurationProvider)
   at SpecFlowConnector.SpecFlowProxies.BindingRegistryFactoryVLatest.CreateObjectContainer(Assembly testAssembly, ContainerBuilder containerBuilder, IRuntimeConfigurationProvider configurationProvider, IDefaultDependencyProvider dependencyProvider)
   at SpecFlowConnector.SpecFlowProxies.BindingRegistryFactoryVLatest.CreateObjectContainer(Assembly testAssembly, Object containerBuilder, IRuntimeConfigurationProvider configurationProvider, Object dependencyProvider)
   at SpecFlowConnector.SpecFlowProxies.BindingRegistryFactory.<>c__DisplayClass2_0.<GetBindingRegistry>b__0(Object dependencyProvider)
   at FunctionalExtensions.Map[TSource,TResult](TSource this, Func`2 fn)
   at SpecFlowConnector.SpecFlowProxies.BindingRegistryFactory.GetBindingRegistry(AssemblyLoadContext assemblyLoadContext, Assembly testAssembly, Option`1 configFile)
   at SpecFlowConnector.Discovery.SpecFlowDiscoverer.Discover(IBindingRegistryFactory bindingRegistryFactory, AssemblyLoadContext assemblyLoadContext, Assembly testAssembly, Option`1 configFile)
   at SpecFlowConnector.Discovery.DiscoveryCommand.<>c__DisplayClass6_0.<Execute>b__0(IBindingRegistryFactory bindingRegistryFactory)
   at FunctionalExtensions.Map[TSource,TResult](TSource this, Func`2 fn)
   at SpecFlowConnector.Discovery.DiscoveryCommand.Execute(AssemblyLoadContext assemblyLoadContext)
   at SpecFlowConnector.ReflectionExecutor.<>c__DisplayClass3_0.<Execute>b__6(DiscoveryCommand cmd)
   at FunctionalExtensions.Map[TSource,TResult](TSource this, Func`2 fn)
   at SpecFlowConnector.ReflectionExecutor.<>c__DisplayClass3_1.<Execute>b__2()
   at EitherAdapters.Try[T](Func`1 act)
Warning: AndDiscoveryProviderSucceed: The project bindings (e.g. step definitions) could not be discovered. Navigation, step completion and other features are disabled. 
  Please check the error message above and report to https://github.com/reqnroll/Reqnroll.VisualStudio/issues if you cannot fix.

Issue Description

I am using the Reqnroll Visual Studio Professional 2022 extension (2026.1.477) with a .NET Framework (4.6.2) test project.
When building the project, I get the following error:

System.TypeLoadException: Could not load type 'System.Xml.XmlNode'
from assembly 'System.Xml.ReaderWriter'

This seems like a mismatch between the .NET version used by the VS extension
and the .NET Framework version of the test project.

Note: SpecFlow bindings are visible and working, so the issue is only with this TypeLoadException.

Steps to Reproduce

Install a Visual studio professional 2022 and install latest Reqnroll extension version (2026.1.477)
Try to create a project and create a .feature file for unit test cases.
then Try to build project then we can get error.

Link to a project repository that reproduces the issue

No response

[clrudolphi]

This is a bug within SpecFlow, that the Reqnroll Extension for Visual Studio happens to use for binding discovery.

Given that SpecFlow is no longer supported, there is nothing we (Reqnroll) can do about it.

Please attempt to migrate your project to Reqnroll as this problem has been addressed and fixed within Reqnroll.

[A95535]

I am not using Specflow, I am using Reqnroll only with latest version 2026.1.477

[clrudolphi]

I am making a distinction between the name/version of the VisualStudio Extension and the name/version of the bdd runtime in use.
The log shows that your project is using SpecFlow:

Info: OnActivityStarted: Starting Visual Studio Extension...
Info: CreateProjectScope: Initializing project: Kiwa.Dataverse.Plugins.Tests
Info: StartRetryInitializeTimer: Project settings not available yet, retry in 5 seconds...
Info: OnSettingsInitialized: Project settings initialized: .NETFramework,Version=v4.6.2,SpecFlow:3.9.74

Are you SURE you are using version 2026.1.477 of the Extension? After you ask the Visual Studio Extension Manager to upgrade to the latest release, you have to close Visual Studio for the upgrade to take effect. Upon relaunch you will be using that version.
I ask because I see a few things in the stack trace that indicate to me that you are using an older version. I might be wrong, but there are segments of that stack trace that mention classes that had been removed from the latest version.

[304NotModified]

Maybe also check your bin folder for any TechTalk/SpecFlow dlls. Maybe it's an indirect dependency in your project?