I'm using version 2017.1.0f3
The files are:
skin.atlas.txt
skin.json
skin.png
I don't understand because the older version was working perfectly.
  
Thanks in advance.
  
  I believe I figured it out.  Apparently if there is  a png that is completely or very close to being empty,  it gives me an error.  I had to make certain layers empty because certain skins had different sorting.  I just left 1 pixel of 3% opacity and that did the trick.