I am getting the exact same error. I am however able to save state up to 10 or so SNES games before I receive the error. I have 46 SNES games split in 2 folders. And even though they are in different folders. I am still unable to get more than 10 save states for SNES games. I have tested this extensively but I do not know how to remedy this. I also have 650 or so NES games but they work flawlessly.
Thank you for verifying that I am not crazy lol. I think it had something to do with the .hmod file. I had tried to install/uninstall a couple of them and it may have messed something up. That and the number of files being shown.
I have since went back to a fresh install of hakchi2 2.12 and using Cluster's original .hmod for retroarch. Then I reduced the number of roms to my favorite 300 NES, 30-40 SNES and 25 or so Sega Genesis. There are only 30 per folder, automatically separated, evenly by first letter. So far it's allowed me save and enter suspend states for all the games that I have tested so far and I have more games than I will need in this lifetime... well I can always add more hehe.
Side Note: messing around in RetroArch Audio settings(turned on audio syncing I believe), I was able to make music/sounds on SMW2 Yoshi's Island MUCH better. I can't wait to get back into that game! Hope this wasn't a fluke and helps others!
Thanks again everybody who has poured their blood, sweat and tears into this wonderful program! Cheers