Well...
I'm on PAL with PONGO and you're on LUNA with PONGO.
I admit, I have no experience if Pongo Skin is the same in all its components on both PAL and LUNA. My tests on LUNA is with default skin.

@NikonM
I highly recommend that you'll answer everything you are asked to check and in an orderly and consistent manner,
like the 2nd/bottom blue question above.

I think that if we have not yet heard (or we won't hear) from other users about the same problem as yours, I'me not sure but, still suspect, that you are probably repeating the same constant error. This is the reason why I asked you at the very beginning, to upload all your process in screenshots.
The "repeated error" is not an accusation It happens to all of us, sometimes.


After we'll eliminate all the above, you will of course get this too
Which file (inside the zip) are you modifying? What exactly are you modifying? What editor are you using?
And maybe, you'll even get a more correct answer, from those who are better than me.