TypeLoadException after upgrade to 6.3.0

ServiceStack
1

Hello,
After upgrading my .NET 6.0 project from using ServiceStack 6.1.0 to 6.3.0 (from nuget.org), I am encountering the following exception when debugging my project:

System.TypeLoadException: ‘Could not load type ‘ServiceStack.MetadataFeatureExtensions’ from assembly ‘ServiceStack, Version=6.0.0.0, Culture=neutral, PublicKeyToken=null’.’

The stack trace is:
at ServiceStack.ServiceStackHost.OnStartupException(Exception ex)
at ServiceStack.ServiceStackHost.OnStartupException(Exception ex, String target, String method)
at ServiceStack.ServiceStackHost.LoadPluginsInternal(IPlugin[] plugins)
at ServiceStack.ServiceStackHost.OnAfterInit()
at ServiceStack.ServiceStackHost.Init()
at ServiceStack.NetCoreAppHostExtensions.UseServiceStack(IApplicationBuilder app, AppHostBase appHost)
at [MyService].Startup.Configure(IApplicationBuilder app, IWebHostEnvironment env) in [MyService]\Startup.cs:line 51
at System.RuntimeMethodHandle.InvokeMethod(Object target, Span`1& arguments, Signature sig, Boolean constructor, Boolean wrapExceptions)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
at Microsoft.AspNetCore.Hosting.ConfigureBuilder.Invoke(Object instance, IApplicationBuilder builder)
at Microsoft.AspNetCore.Hosting.ConfigureBuilder.<>c__DisplayClass4_0.b__0(IApplicationBuilder builder)
at Microsoft.AspNetCore.Hosting.ConventionBasedStartup.Configure(IApplicationBuilder app)

Seeing other similar issues in this forum, I have already tried several steps to fix this problem, including:

  • Deleting all /bin and /obj folders in all project folders in the solution
  • Deleting my global /packages folder
  • Running from the command line: nuget locals all -clear
    Nothing I try fixes this problem. Can you recommend any other steps to try? I am at a loss for why this is occurring. Thanks in advance.
2

Hi @sharding,

The MetadataFeatureExtensions class was refactored out between 6.1 and 6.3 so it sounds like there might still be a mix of dependencies or bad cache. Couple of things to check.

  • Make sure all ServiceStack references are using the same version, eg 6.3 or 6.* in your .csproj files.
  • When clearing your local nuget cache, use the command dotnet nuget locals all --clear from the same environment you are developing from with, eg WSL2 will clear different a different cache than a terminal from the Windows command prompt.
  • Check if you have a NuGet.config file in your repository and if it is using any other NuGet sources
3

Thanks for the reply @layoric.

This code is in my AppHost.cs Configure override method:

Plugins.Add(new AdminFeature());

AdminFeature class is part of the ServiceStack.Admin namespace and the highest version of ServiceStack.Admin is 6.0.2.

If I comment out the above line, then my service starts up in the debugger just fine, without the exception. However, I am not sure what that line is supposed to do or whether my service needs it. I inherited responsibility for this service after it was implemented, so I don’t know everything about it yet. I am currently trying to verify if it passes integration tests without the above line.

4

Right, it’s because the AdminFeature from ServiceStack.Admin NuGet package has been deprecated and replaced with the new Admin UI and Locode that’s now built into ServiceStack, it’s last supported release was v6.0.2.

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5

Thanks for the reply @mythz, this helps. I resolved the problem by removing the AdminFeature plugin and removing the reference to ServiceStack.Admin.

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