there is a bug in the game that is pretty consistent. I go to fight the demon lord and I win. After that, a command error message pops up along with some recorded dialogue. No matter what I push, the error never stops coming and the message never stops playing, so I believe the two are connected.
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The message came from skipping through the battle too quickly. Even when I told the game I wanted to see no battles, it still made me see this one and it was getting pretty long, so I tried skipping it, and it crashed the game. So, I bit the bullet and tried again, and did not skip the battle, and it went as planned.