Thank you so much for sending me this! Can you remember where you were or at what point this happened? Was it after running into an enemy or was it after falling in water/off a ledge/hit by fire and then getting an automatic encounter? And thank you for the kind words as well!
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Sorry for such a late reply, but I took a break from the game after trying out the boss fight for the first time and had played around 8 hours in total already in that one save file. However, when I tried to open the save file, that was the message I got. I had no trouble before with the opening and saving and I didn't necessarily try out anything in-game that would have messed with any files or gameplay, so it was not an error from mid-game. I left the game at just a random spot too, so it was not in the middle of anything.