How come i can't use the spot healing brush tool on some of my pics?

I'm trying to remove some wrinkles from my pics and i've realized i can't do it with some pics.
It works fine on raw with my nikon pics… But this one is canon and is in the "PEF" format.

I had never heard of that format, so I just looked it up. This is what I found: "
PEF is a digital image format used in Pentax digital cameras. Like NEF, CR2, ORF and other raw formats, PEF has all functions of a digital negative… "

So if PS can't handle it, you may need to convert the format first and THEN work with it.