this error usually occurs when the game is trying to load something that doesnt exist, in this case probably an animation. This is most common if you are using save data created in an earlier version on the newest version of the game.
Unfortunately, there isn’t any that I’ve found. This has been an issue since day 1, which is why I stress in the readme file to use one of the included save files. If there are things that change with the game’s design, there will be conflicts if you load a save where those changes never existed. There’s not much I can do about it, as this is a work in progress. I am very sorry for the inconvenience.