almost 4 years ago - Avanya - Direct link
We'll need to see the output_log.txt (called player.log on Mac and Linux) to see what's causing it. Here's where to find the log depending on your operating system. To easily find the local files for the game, right click your game in the Steam library, select Properties, go to the Local Files tab and select Browse local files.

Windows
\SteamApps\common\Cities_Skylines\Cities_Data\output_log.txt

Mac OS X
Users//Library/Logs/Unity/Player.log

Linux
~/.config/unity3d/Colossal Order/Cities: Skylines/Player.log


As we can't attach files here on Steam, you will need to upload the file somewhere else. Here's a few sites you can upload it to, which do not require you to sign up first:

https://uploadfiles.io/ - free, no sign-up, can handle large log files
https://paste.ee/ - fast, no sign-up required (some log files will be too large for it though)
https://zerobin.net/ - bit clunky, but can handle huge files, no sign-up required
almost 4 years ago - Avanya - Direct link
Let's start by removing old broken mods. Remove these and get the replacements where available:

- Automatic Bulldoze v2 - get version 3 instead
- Extended Public Transport UI - this was added to the game long ago, the mod is not needed and likely broken

Then get the Loading Screen Mod, make sure to enable it and then go into Options. Find it on the left, then find the Safe Mode options and enable them all. Then try loading your save.
almost 4 years ago - Avanya - Direct link
Try adding these two mods, enable them, restart the game and check that the Safe Mode options are still enabled.

https://steamcommunity.com/sharedfiles/filedetails/?id=529129546
https://steamcommunity.com/sharedfiles/filedetails/?id=1620588636
almost 4 years ago - Avanya - Direct link
Can you upload another log with all the mods and the Safe Mode options enabled? The lower amount of errors might get us to the cause of the problem easier.