PKHeX don't open Desmume roms

[The Practice of Chaos]

I just downloaded new Pokemon Platinum rom, started to play, made my first save and then tried to open this save in Pokehex. And that's what I see. The file couldn't have been damaged in the five minutes that I played it. Phex has also just been downloaded. This error usually comes out if you edit GBA roms and then try to open a Desmume rom. In this case, you have to delete all the old roms and download new ones, but this time they were new. I do not know what to do with this stupid shit. 

[foohyfooh]

You are trying to edit the wrong files. PKHeX is for opening .sav or .dsv files from NDS emulators not the roms. The .dsv save files should be in the battery folder for DeSmuME or you can get the .sav files from it if you export backup memory.