You mentioned that these are .html files. Of course they are not .cshtml?
Distinctive features of the domain - your host does not have the "System.Web.Helpers" ASP.NET Webpages assembly in its GAC or is otherwise available for your deployment.
To solve this problem, you need to deploy assemblies. Start by creating the bin directory and loading System.Web.Helpers.dll there.
You will find it on your development machine somewhere like C:\Program Files (x86)\Microsoft ASP.NET\ASP.NET Web Pages\v1.0\Assemblies\System.Web.Helpers.dll
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