Error cloning a wiki?

Hello, I am new to using Github, howver want to help a minecraft plgin with it’s wiki.
I cloned https://github.com/Ghost-chu/QuickShop-Reremake

to my desktop, although I cannot actually see any files in it?

When I tried to add another repository for https://github.com/Ghost-chu/QuickShop-Reremake/wiki  it came up with the error 

Any suggestions on how I get a local copy of this wiki please?