Error message .net website

The error page doesn't reveal the real error. Therefore, run the website again on the server itself (it will show a different more detailed error page), or enable error reporting as stated in the screenshot (then you can run the website again on the same PC as you took the screenshot from).

The error is coming from the web site on the server.  It runs fine on my PC

I know. But right now, we don't know what the error is. To investigate it, we need the exact REAL error (right now, the screenshot shows an error where it says it will not show you the exact error. This is expected behaviour for security reasons. However to investigate more, you should circumvent this general error, to display the real error).
I said run this website again on the server or on your PC. I meant, display it in the browser of the server, or adjust settings (as displayed on the screenshot), and then display it on your PC. Because then it will show the real error and we can start solving it.

I don't know if I am following you.  I ran it again from Visual Studio on my PC.  It runs with no errors.

I followed the instructions, and made the changes to the web.config file, but nothing has changed.  I still see the same page.

The problem was the use of an alias.  I had to copy the files from the alias and put them in the real domain.  Damn this can be confusing!