SSIs and .php files not properly set up
[Using DW CC 17.0.1 on macOS Sierra]
Earlier this week, I set up a Testing Server on three of sixteen directories, with the help of Nancy Oshea and Jon Fritz. However, I see that my setup efforts haven't been successful. When I right-click a file in the Files panel and choose "Open in browser" to see locally any of the files in those three directories, I cannot connect to the newly created localhost and I get this error message on my browsers. . .

Note: When I do similarly to pages in the other thirteen directories — that don't currently have a Test Server on a localhost set up on them — those pages open as they should in browsers. So, obviously, I've not set up the Testing Server in those three directories correctly.
I've since contacted my host/server to resolve this, but the technician would only confirm that my definition was incorrectly set up but couldn't advise me on how to personally set up the localhost.
So, who can help me correctly set up my Testing Server on those three directories?
If it helps, below I'll provide screen shots of the DW setup windows, as well as the pathway to my files that I've placed on XAMPP.
1. This first shot shows the Testing Server setup window for one of the three problematic directories (titled "heartyBoys").

2. This shot shows for the same "heartyBoys" directory the entries I made in the four fields.
3. And here is the pathway to the "heartyBoys" directory that I copy/pasted into, and now resides in, the "htdocs" folder of XAMPP.

Would someone familiar with such Testing Server setups please show me my error and what exactly I need to enter so I can get this process to work as it should? I'll be most appreciative.
Warren

