I can’t add any more layouts/text to my about me page. It won't save

I don’t have many layouts (about 4), so the code isn’t extremely long or anything, but I, for some reason, can’t add any new layouts into the about me page. It probably has to do with the code on one of the layouts that seems to prevent me from saving code for new layouts, but I don’t know what is wrong with my code in particular. Could someone help me with the code and what I need to fix?

Here is the link for the code: https://codefile.io/f/1wy4BoMSnY