Can anyone tell me what I'm doing wrong? My entire code is working, except the header. I've asked several people and it works for all of them, but not for me.

I had the same issue while I was making my current palette. What I had to do was just start over. I copied and pasted the whole original/default palette and then scrolled to the bottom and added the header first. Then went back and filled everything in. You could just try doing that or go back and check that all the code you have is right. Sometimes parts of the coding will accidentally delete or just dissapear.