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Unhandled Exception: The entry 'Html' has already been added.

Jun 17, 2013 at 3:23 PM
I am using the default NUGet installation with Visual Studio 2012. Framework 4 MVC 3 application.

I keep getting "Unhandled Exception: The entry 'Html' has already been added.".

The only way I can get it to work is by actually removing all of the writers from the web.config.

When I do this however, anytime I use the .xlsx extension, it is returning a file of 0 bytes.

Thoughts and ideas are appreciated.