HTTP Error 500.19 - Internal Server Error

[MrChriZ]

I'm having problems with the config entries that are created by elmah-mvc.

I get an http error
HTTP Error 500.19 - Internal Server Error
Cannot add duplicate collection entry of type 'add' with unique key attribute 'name' set to 'ErrorLog'

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I've tried completely clearing the web.config of all Elmah entries - removing Elmah MVC at which point the project runs fine. Then use Nuget to get Elmah MVC and it produces the error again.