Sorry to hear you're having this problem. I can't guarantee this will work, but have you tried doing what the error says to do? Going into the folder it's telling you to go into and renaming that specific file to have the underscore at the end?
i did do that yeah, multiple times, however it seems that it reverts back to "C:\Users\User\Desktop\Clinical Trial\save\Preload_JSON.rmmzsave" even after renaming it and replaying that moment in the game
sometimes it would follow through, allowing me to move on to another cutscene, but it'd happen again when i try to go to the next cutscene