Help! My cites are broken!

[mtacreeoer 0]

Recently, I have encountered an error when trying to load my city saves. Two of my cities share this error. The error is "Simulation error. Argument is out of range. Parameter name: Index

Does anyone know how to fix this?

 

output_log.txt

[mfcnr 38]

Sorry to hear that but quite frankly, every large city I've made over the years(around 12) has been lost with the "Simulation: (failed) " message and a weird purple load with no buildings or features. Others have never lost a save, so I don't really know what the issue is. It's generally believed that it is either corrupted assets or mods that cause this, but even when that issue is cleared-up, the loads will still not load. I believe it is the saves themselves that become corrupted, especially if they are stored on the Steam Cloud. All I can say is do like I do and just start a new one over again with the realization that cities only last a few months, so enjoy them while you can.