For MVC5,

I have installed the package: DD4T.LogWrappers.Log4NET using below command successfully:

install-package DD4T.LogWrappers.Log4NET -Version 2.0.0-alpha5

Surprisingly, the DD4T website started throwing below error. When using MVC4, installing the same package is fine.

Below is the Exception logged while calling builder.UseDD4T():

Could not load type 'DD4T.ContentModel.Logging.ILogWrapper' from assembly 'DD4T.ContentModel.Contracts, Version=, Culture=neutral, PublicKeyToken=4450e3c7f68bf872'

below is the <code>Global.asax.cs</code> file co

I also verified the DLL and there is NO DD4T.ContentModel.Logging folder/namespace present as seen below for MVC5:

enter image description here

2 Answers 2


You seem to be using the wrong DLL for DD4T logging.

Try using DD4T.Logging.Log4Net.dll version 2.2.0
URL: http://www.nuget.org/packages/DD4T.Logging.Log4Net/2.2.0

You seem right that , with MVC5 onwards, The namespace DD4T.ContentModel.Logging is moved to dll DD4T.Core.Contracts.

And, BTW, how and where do you got the DD4T.LogWrapper.Log4NET.dll ? It is unlisted by authors on Nuget.

  • using DD4T.Logging.Log4Net.dll worked like a charm for me. I guess www.nuget.org is the correct website for packages. I mistakenly downloaded the logwrapper dll from STAGING website: staging.nuget.org/packages/DD4T.LogWrappers.Log4NET Jun 12, 2017 at 4:25
  • 1
    What purpose is the staging website of nuget is for ? Also, if it is staging why is it visible to public ? Jun 12, 2017 at 4:26

As you can see, you are installing D4T.LogWrappers.Log4NET -Version 2.0.0-alpha5 version, but you are getting error message related to version

DD4T.ContentModel.Contracts, Version=

So, I suspect that it is a version mismatch issue and you can resolve it by updating the right version of your dependencies in your package.config file.

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