Savegame compatibility between PSP and PPSSPP?

[Avenot]

Hi there!

Wasn't sure where to put this, so I hope this is the right place...

I've spent quite some time playing Hatsune Miku Project Diva 2nd in PPSSPP, but I'd like to continue playing on my PSP now. I assumed I just had to copy the savegame to my memory stick, but I did that and when I tried loading the save, it just gave me an error message and threw me back to the title screen.

Is there any way to get these PPSSPP saves to work on the PSP?