I just started getting this error lately when i try to import any roms. I successfully updated nintendo, supernintendo, nintendo64 without incident. I tried to manually input an emulator name for stella then assigned it to atari 2600 when i first noticed the problem. So even though i really dislike retroarch I decided to just put in on and use a preconfigured emulator but it is doing the same thing. Only other issue i noticed before is when i updated a Sega Genesis game "Sonic the Hedgehog" as a single rom it auto assigned it to sega game gear i believe then i corrected it back to Genesis. In short though, i can no longer add anything to my library without the error. I'm using a clean install of windows 10 pro, and installed a sandisk ssd for speed which is working out beautifully. Intel i3, 4GB ram.