In the launcher for me when I try adding a skin it says only skins that are 64x64 or 64x32 pixels work even though the skin I am uploading is 64x64 pixels

I was trying to add a new skin to my launcher but it did not work, it instead said skin files have to be 64x64 or 64x32 pixels even though the skin file I uploaded was 64x64 pixels, I then tried uploading other 64x64 skins, including some I already had saved to my launcher, and even a couple 64x32 ones, but none of them worked they all still said it had to be 64x64 or 64x32 pixels even though it was.