I upgraded a site from 7.3.3 to 7.4.2 successfully.  As part of the process, I removed an old portal and a ton of old modules that were no longer in use.  I then upgraded to 8.0.4 and it appeared to work successfully.  Unfortunately when I tried to go to the website, I got the following error:

Server Error in '/' Application.

Runtime Error

Description: An exception occurred while processing your request. Additionally, another exception occurred while executing the custom error page for the first exception. The request has been terminated.

After some research, I turned off custom errors and now get this message:

Server Error in '/' Application.

Object reference not set to an instance of an object.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error:


An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:



[NullReferenceException: Object reference not set to an instance of an object.]
DotNetNuke.Web.Mvc.MvcHttpModule.SuppressXFrameOptionsHeaderIfPresentInConfig() +248
DotNetNuke.Web.Mvc.MvcHttpModule.Init(HttpApplication context) +12
System.Web.HttpApplication.RegisterEventSubscriptionsWithIIS(IntPtr appContext, HttpContext context, MethodInfo[] handlers) +534
System.Web.HttpApplication.InitSpecial(HttpApplicationState state, MethodInfo[] handlers, IntPtr appContext, HttpContext context) +172
System.Web.HttpApplicationFactory.GetSpecialApplicationInstance(IntPtr appContext, HttpContext context) +339
System.Web.Hosting.PipelineRuntime.InitializeApplication(IntPtr appContext) +296

[HttpException (0x80004005): Object reference not set to an instance of an object.]
System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +9946132
System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +90
System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +261




Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.6.1085.0

I am at somewhat of a loss on this.  I have installed a clean DNN8 installation at my hosting provider so I know it should at least work.  Any clues as to weher to look would be fantastic.

Cheers