Could not load file or assembly 'Microsoft.AspNet.TelemetryCorrelation' or one of its dependencies. The system cannot find the file specified

Question

I have two web applications under IIS 7 (local Windows 10 Pro). At the root is an MVC .Net Version 4.7.1. Everything seems to work fine here so far. However, set up as a separate application under the default site root is an older .Net Version 4.0 WebForms application.

The version 4 application is built in Visual Studio 2015 and the MVC is built using Visual Studio 2017. I have the version 4 WebForms app running under a different website with the same settings and it runs fine. It only has a problem when running under the root node as a different application. Also I have tried using different App Pools on both application as well as using the same App Pool with no change in the error.

I have also tried uninstalling ApplicationInsights and disabling it and I get the same issue.

[FileNotFoundException: Could not load file or assembly 'Microsoft.AspNet.TelemetryCorrelation' or one of its dependencies. The system cannot find the file specified.] System.RuntimeTypeHandle.GetTypeByName(String name, Boolean throwOnError, Boolean ignoreCase, Boolean reflectionOnly, StackCrawlMarkHandle stackMark, IntPtr pPrivHostBinder, Boolean loadTypeFromPartialName, ObjectHandleOnStack type) +0 System.RuntimeTypeHandle.GetTypeByName(String name, Boolean throwOnError, Boolean ignoreCase, Boolean reflectionOnly, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean loadTypeFromPartialName) +95 System.Type.GetType(String typeName, Boolean throwOnError, Boolean ignoreCase) +64 System.Web.Compilation.BuildManager.GetType(String typeName, Boolean throwOnError, Boolean ignoreCase) +60 System.Web.Configuration.ConfigUtil.GetType(String typeName, String propertyName, ConfigurationElement configElement, XmlNode node, Boolean checkAptcaBit, Boolean ignoreCase) +49

[ConfigurationErrorsException: Could not load file or assembly 'Microsoft.AspNet.TelemetryCorrelation' or one of its dependencies. The system cannot find the file specified.] System.Web.Configuration.ConfigUtil.GetType(String typeName, String propertyName, ConfigurationElement configElement, XmlNode node, Boolean checkAptcaBit, Boolean ignoreCase) +558 System.Web.Configuration.ConfigUtil.GetType(String typeName, String propertyName, ConfigurationElement configElement, Boolean checkAptcaBit) +30 System.Web.Configuration.Common.ModulesEntry.SecureGetType(String typeName, String propertyName, ConfigurationElement configElement) +57 System.Web.Configuration.Common.ModulesEntry..ctor(String name, String typeName, String propertyName, ConfigurationElement configElement) +57 System.Web.HttpApplication.BuildIntegratedModuleCollection(List`1 moduleList) +182 System.Web.HttpApplication.GetModuleCollection(IntPtr appContext) +1086 System.Web.HttpApplication.RegisterEventSubscriptionsWithIIS(IntPtr appContext, HttpContext context, MethodInfo[] handlers) +120 System.Web.HttpApplication.InitSpecial(HttpApplicationState state, MethodInfo[] handlers, IntPtr appContext, HttpContext context) +169 System.Web.HttpApplicationFactory.GetSpecialApplicationInstance(IntPtr appContext, HttpContext context) +372 System.Web.Hosting.PipelineRuntime.InitializeApplication(IntPtr appContext) +329

[HttpException (0x80004005): Could not load file or assembly 'Microsoft.AspNet.TelemetryCorrelation' or one of its dependencies. The system cannot find the file specified.] System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +525 System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +118 System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +708

Answer 1

In my case, sub app wasn't using ApplicationInsights and I added these exclusions to the sub app web.config file. It fixed the problem.

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
  <system.webServer>
    <modules runAllManagedModulesForAllRequests="false">
      <remove name="TelemetryCorrelationHttpModule" />
      <remove name="ApplicationInsightsWebTracking" />
    </modules> 
  </system.webServer>
</configuration>

Here is the discussing topic where I have found my answer https://github.com/aspnet/Microsoft.AspNet.TelemetryCorrelation/issues/21#issuecomment-508535397

My answer is a late answer but it might help someone else.

Answer 2

You can use NugetPackage Manager and browse for Microsoft.AspNet.TelemetryCorrelation and install it.