I asked the same thing on the discord and didn't get a response. Hopefully we can get some answers on this platform.
thebaron2 posted this on reddit:
I slept in a trailer first, got the error on waking when it tried to auto save. Hopped in the car and drove to a campsite nearby. Camped. When I woke up it gave me the error again when it tried to auto save, but then I tried manually saving it and worked.