This is just a theme that I am editing and I can’t currently publish it as it is not completely finished, the link that I left above is the link to the download of the theme that I used, there were two versions called Doris1 and Doris2, I chose Doris1 and I noticed this problem
It seems the wishlist page isn’t set up yet. You will need to either set up the page or use some 3rd party app (they mostly have the wishlist page set up). I personally use this https://apps.shopify.com/stellar-point