Swagger.NET MVC Api Exception

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MVC

WebAPI

Been looking at different options for providing auto generated API Documentation and Swagger seems to be up there.
However when trying this out for the first time I'm getting exceptions on start up.
Running Visual Studio 2013. Create new Web API project. Using Package Manager, run Install-Package Swagger.Net & Install-Packager Swagger.Net.UI
Making sure we've enable the XML documentation we get this exception:
Method 'GetDocumentation' in type 'Swagger.Net.XmlCommentDocumentationProvider' from assembly 'Swagger.Net, Version=0.5.1.0, Culture=neutral, PublicKeyToken=null' does not have an implementation.
Does anyone else know of a step we are missing? We found & followed this: https://github.com/Swagger-Net/Swagger.Net/wiki https://github.com/Swagger-Net/Swagger.Net/blob/master/README.md
Thanks