i assume you mean when you bring up the screen with the saves?
There is more to the error below if you keep scrolling down, consider taking screenshots (press S on your keyboard to save them in your folder) and send here.
For now, i can guess two things: you named your file with a weird character in the game, we know "[" breaks the game, i can fix that by going in the code, send the save here and i'll do it for you, if that's the case (Caro is fixing that in the next version btw). OR it's something related to a save thumbnail? Try renaming your saves in the "game --> saves" folder so they appear in a different page in-game when you call the saves screen... For example, a file named "8-3-LT1.save" shows up at page 8, top right, make it so they all appear in different pages, so you will find out which is the corrupted one once you check that page.