If you use mods please check your mods against the list of broken mods, both the first tab and especially the tab named Patch 1.17.0.
https://pdxint.at/BrokenModCSIf that doesn't help or you don't use mods, please make a thread on our support forum. We need to see your output_log.txt (called player.log on Mac and Linux) to be able to help, which cannot be attached here on Steam.
https://forum.paradoxplaza.com/forum/forums/support-bug-reports.879/Depending on your operating system the log can be found here:
It's also worth noting that the notification in the Content Manager does NOT tell you a mod is broken, it can only tell you the mod was not made with the current version of the game. A mod may work perfectly fine despite this.
https://pdxint.at/BrokenModCSIf that doesn't help or you don't use mods, please make a thread on our support forum. We need to see your output_log.txt (called player.log on Mac and Linux) to be able to help, which cannot be attached here on Steam.
https://forum.paradoxplaza.com/forum/forums/support-bug-reports.879/Depending on your operating system the log can be found here:
Windows\SteamApps\common\Cities_Skylines\Cities_Data\output_log.txt \CitiesSkylines\Cities_Data\output_log.txtMac OS X
~/Library/Logs/Unity/Player.logLinux
~/.config/unity3d/Colossal Order/Cities: Skylines/Player.log
It's also worth noting that the notification in the Content Manager does NOT tell you a mod is broken, it can only tell you the mod was not made with the current version of the game. A mod may work perfectly fine despite this.