The rom header is invalid. The device size has been increased to allow for the provided size

[Nayru]

Hello there!

I am brand new using PKhex, so I don't know what mistake I may have made.
I used Pkhex to transform my dratini into shiny and added some rare candies to my bag and saved the changes. 
Every time I try to open my save (HeartGold) in Desmume the following message appears: "The rom header is invalid. The device size has been increased to allow for the provided size". As a result, I can no longer play the game. 
Can you please help me with this?

 

Edited June 19, 2023 by Nayru

[theSLAYER]

I’m confused. SAV edits should not affect ROMs?

[Nayru]

Now I am the one who is confused.

As I said before, I have no idea what to do to continue playing because the game no longer opens. Instead, the message above (in the title) appears. I have never used PKhex before, I am just asking for help with it.

[BlackShark]

This does not sound like a problem caused by PKHeX. It's either your ROM that got corrupted or some faulty emulator settings.

Things you can try:

• if you have cheats active, remove or disable all of them
• delete your emulator settings (should be desmume.ini, or something like that)
• delete and redownload the latest version of the emulator and all of its files
• redump your game
• try melonDS instead https://github.com/melonDS-emu/melonDS/releases/latest

[Nayru]

Thanks a lot, BlackShark! 

Solved!!!