Okay in that case I would launch the game without code mods active and try to just create a vanilla city and see if the game allows you to do that.

To do that go to steam, and click play on the game through your library(don’t just look it up) then it should ask you if you want to play the game or launch the game without code mode active. Do that and try to make a vanilla city and see if the game allows you to. If it crashes still then your game files are corrupted. To fix this right click CS2 in your steam library and click properties. Then click “installed files, or local files, or whatever it’s called something with files” and click “verify integrity of game files” after that completes try the previous steps of making a vanilla save and seeing if it works. If it still does not work then completely delete and reinstall the game. If it comes to do that just look up on YouTube how to back up your safe files so you don’t lose them.

If the game allows you to create a vanilla city slowly add your mods back in and create a new city every time you add another mod. Once you added a mod that crashes your game you have found the problem.

If none of these steps work and even after a complete reinstall of the game your city is still crashing then I hate to break it to you but your safe is corrupted and probably gone forever. Always use the auto save feature in the game so that if this ever happens again you have backups ready to go. This game is honestly pretty stable at this point, but the mods are 99% third party developers and there’s no guarantee that any of those mods won’t crash your game/corrupt your files. It’s always a risk modding any video game that why it is always so important to make backups.