Integrating Elmah.MVC to Production code

[hemnath283]

Hi,
I am working on a MVC 4 project and I am trying to integrate Elmah.MVC to the application.
I copy pasted the web.config settings created in my Demo project using Elmah.MVC nuget package to production web.config file. Placed the elmah.MVC.dll and elmah.dll from packages\elmah.corelibrary.1.2.2\lib and \packages\Elmah.MVC.2.1.1\lib to Production bin folder. merged the packages.config file settings. but I am getting "500 - Internal server error.
There is a problem with the resource you are looking for, and it cannot be displayed.". Please let me know how to resolve it. I have not added the dll reference to my project as I dont want to rebuild my code.

Please let me know how to resolve the issue.