IIS HTTP Error 500.19

This issue took me the best part of a day to figure out, as I had the exact same code working on another machine in the office.

It turns out that I was missing some features in IIS, and that the web.config I had carried down was looking for these features. I was missing both authentication features and the URL Rewrite module, and as a result IIS believed my web.config was malformed.

There are similar answers across the Internet that mention the URL Rewrite module, so I'd look there first.

installing iis rewrite module helped me here.

The requested page cannot be accessed because the related configuration data for the page is invalid error

-Naval