ERROR: IGNORING GAMA CHUNK WITH GAMMA=0

Does anyone know what causes this error in VX?

http://rpgmaker.net/users/kitten2021/locker/ErrorWithSpritesChipsets.png

I have started receiving this with my chipset I created and placed in my game, which now has automatically deleted itself... And also with my custom made charset (which I have made 107 exactly, so I would hate to have those auto-deleted as well).

Any help appreciated... Thank you guys!

So... in a since, this TweakPNG thing is what I can use to place my files in there and save them out of there to prevent the error from appearing again?

EDIT: BTW, where can I get the original Chipset for VX please?