Whenever we restart or deploy to our server, I get the following error message for as long as I can remember.

    2019-02-06T17:56:51  PID[9040] Warning     9428 17:56:51 WARN  Counter initialization. Loading types from assembly Sitecore.EmailCampaign.Activities, Version=, Culture=neutral, PublicKeyToken=null failed
Exception: System.Reflection.ReflectionTypeLoadException
Message: Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information.
Source: mscorlib
   at System.Reflection.RuntimeModule.GetTypes(RuntimeModule module)
   at System.Reflection.Assembly.GetTypes()
   at Sitecore.Cloud.ApplicationInsights.CounterLoader.<>c__DisplayClass1_0.<LoadCounters>b__1(Assembly a)

I'm using Sitecore 9.0.2 (180604) on an Azure App Service. Our local DLL version matches what's on our upstream servers. The image below shows the DLL version:

Sitecore.EmailCampaign.Activities.dll version

How can this issue be resolved?

  • Have you checked the mentioned assembly in your bin directory and the assembly's version? Is this an upgraded solution or a clean install of sitecore 9u2? Does it run on Azure AppService or an onpremise solution? Feb 7, 2019 at 13:55
  • @ÁrvaiMihálythe question has been updated. Thanks! Feb 7, 2019 at 17:50
  • @Marcel Looks like in web.config in Azure App Service requires a, but probably you have deployed version 6.0.1. Feb 7, 2019 at 19:14
  • Thanks @ÁrvaiMihály. Would you kindly elaborate on how that can be found? I'm unable to locate such a reference in any .config files. Feb 8, 2019 at 17:47
  • My last comment was intended to tag @TamásTárnok Feb 11, 2019 at 20:54

1 Answer 1


It's seems to be a bug in "Sitecore.EmailCampaign.Activities.dll", since it's compiled with a reference to the assembly "Sitecore.Marketing.Automation.Activity", which seems not to be present in the Azure packages for 9.0.2. - I would report it as a bug to Sitecore if I was you.

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