I'm working on an Orchard Core 1.6.0 solution where I've added two modules: a theme and a "History" module.

The theme, as best I can tell, works fine. It even fetches the Layout.liquid without issue. The History module, on the other hand, gives me this:

It does this regardless of whether or not I "return View()" as "Index", "./Views/Home/Index.cshtml" or "~/Views/Home/Index.cshtml"
My startup.cs looks like this:

Can anyone provide some clues as to what is going on here? I've scoured the All-Knowing 'Net and tried what solutions I could but nothing seems to work. Any and all clues greatly appreciated.