u/Mindless-Sky-9100

So, I've had this game since it came out and have never had a single issue. I started working on a city and have gotten it to around 500 people.

Out of nowhere, I can't seem to save the game. Every time I try, I'm presented with the error attached. I can still load my save and play the game, but it won't save any of my progress.

I've tried creating a completely fresh map, and get the error if I try to save those ones as well.

I've also tried to uninstall/reinstall the game and this error is persisting.

Any idea how to fix it?

Thank you.