I have an existing MVC internet application, I want to use windows authentication, But it gives error when I set web config .

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I have an existing mvc internet application,

I did set web.config file option authentication mode to windows.
and in the project property i disabled anonymous user disable and windows mode enable ,

In this way it gives error : login.aspx page which is not exist in my Regor_view_engine

Here what I want is : No anonymous user should use my application..! so I thought of converting it into intranet application so that no one outside my company can use it.

for that I does above settings, but did not get success

Experts please help
Thanks in advance.