8.1 Upgrade Error -- Could not load type 'Telerik.Sitefi

Upgrading has not been a smooth ride.  I am going from 8.0 to 8.1.  

 I have Babaganoush installed.  I have also installed the Microsoft Asp.Net Web Api 2.2.

Full Text of the error -

Could not load type 'Telerik.Sitefinity.Mvc.Proxy.MvcControllerProxy' from assembly 'Telerik.Sitefinity, Version=8.1.5801.0, Culture=neutral, PublicKeyToken=b28c218413bdf563'.

[TypeLoadException: Could not load type 'Telerik.Sitefinity.Mvc.Proxy.MvcControllerProxy' from assembly 'Telerik.Sitefinity, Version=8.1.5801.0, Culture=neutral, PublicKeyToken=b28c218413bdf563'.] Babaganoush.Sitefinity.Utilities.ConfigHelper.RegisterToolboxWidget(String title, String description, String cssClass, String resourceClassId, String layoutTemplate, String sectionName, Nullable`1 sectionOrdinal, ToolboxType toolboxType) +0 Babaganoush.Sitefinity.Mvc.Startup.OnBootstrapperInitialized(Object sender, ExecutedEventArgs e) +704 System.EventHandler`1.Invoke(Object sender, TEventArgs e) +0 Telerik.Sitefinity.Abstractions.Bootstrapper.Bootstrap() +890 Telerik.Sitefinity.Abstractions.Bootstrapper.Bootstrap() +759 Telerik.Sitefinity.Web.SitefinityHttpModule.Init(HttpApplication context) +400 System.Web.HttpApplication.RegisterEventSubscriptionsWithIIS(IntPtr appContext, HttpContext context, MethodInfo[] handlers) +530 System.Web.HttpApplication.InitSpecial(HttpApplicationState state, MethodInfo[] handlers, IntPtr appContext, HttpContext context) +304 System.Web.HttpApplicationFactory.GetSpecialApplicationInstance(IntPtr appContext, HttpContext context) +404 System.Web.Hosting.PipelineRuntime.InitializeApplication(IntPtr appContext) +475 [HttpException (0x80004005): Could not load type 'Telerik.Sitefinity.Mvc.Proxy.MvcControllerProxy' from assembly 'Telerik.Sitefinity, Version=8.1.5801.0, Culture=neutral, PublicKeyToken=b28c218413bdf563'.] System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +12979668 System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +159 System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +12819261​

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Well this might be fixed.  I just updated Json.  That caused another incompatibility.  I couldn't uninstall it until I unistalled Asp.Net Web Api 2.2.  I did that.  I then unistalled Json.  Reinstalled Web Api 2.2.  Recompiled and the site came up to the license activation screen. 

 Which I can't get past yet.  But progress.

Do you have the latest version of Babaganoush as well?

Yes.  I updated that.

I had to do a lot of updating of nuget packages to get it all to work.  The site is now updated.