The capitalization of the folder was the issue. I had it PHx instead of phx. Thank you so much everyone who responded. This was my first time posting on the message board and I have to say, it’s a lot easier than searching for days on end for someone else who had already asked the question.
I did have another question - down the road, that sidemenu will be different for different parts of the site. Will I have to have a new template for each one of those pages? I have no problem using separate templates, but the boss is too picky! He wants as few templates as possible.