Thank you.
The log tells us "Exception: Couldn't find a place to stop rolling back. Perhaps the script changed in an incompatible way?"
Which is what usually happens when the save is incompatible. So there isn't much I can do to help, I'm afraid.
I don't think it's related to the issue but the log is referring to a SummerHeat directory. I don't think that's the source of the issue.
Is this your only save? Or do you have more than one? If you do, do they all return you the same error?
Thank you in advance for your answers.