Cities: Skylines (Steam) - Launching the game failed [Mac]

  • Crusader Kings II Expansion Subscription

    Subscribe to the CK II Expansion and enjoy unlimited access to 13 major expansions and more!

  • Crusader Kings III Available Now!

    The realm rejoices as Paradox Interactive announces the launch of Crusader Kings III, the latest entry in the publisher’s grand strategy role-playing game franchise. Advisors may now jockey for positions of influence and adversaries should save their schemes for another day, because on this day Crusader Kings III can be purchased on Steam, the Paradox Store, and other major online retailers.

    Real Strategy Requires Cunning


10 Badges
Apr 17, 2021
  • Cities: Skylines
  • Cities: Skylines - After Dark
  • Cities: Skylines - Snowfall
  • Cities: Skylines - Natural Disasters
  • Cities: Skylines - Mass Transit
  • Cities: Skylines - Green Cities
  • Cities: Skylines - Parklife Pre-Order
  • Cities: Skylines - Parklife
  • Cities: Skylines Industries
  • Cities: Skylines - Campus
Describe your issue
Launching the game failed

What is your game version?

What expansions do you have installed?
After Dark, Snowfall, Natural Disasters, Mass Transit, Green Cities, Parklife, Industries, Campus, Sunset Harbor

What mods are you using?
Uninstalled all of them

Please explain your issue is in as much detail as possible.
Uninstalled all my mods, steam and all it's content. Re-installed, after pressing play, paradox launcher open, and gives me the error message "launching the game failed" I'm using a Mac Big Sur

Can you replicate the issue? If yes, please explain how you did it.

Attachments File(s) attached


  • Schermafbeelding 2021-04-17 om 16.11.44.png
    Schermafbeelding 2021-04-17 om 16.11.44.png
    5,2 MB · Views: 0
Upvote 0


The Full Monty Python
Paradox Support Rep
Super Moderator
114 Badges
Jun 29, 2001
  • Leviathan: Warships
  • Europa Universalis IV: Wealth of Nations
  • Europa Universalis IV: Call to arms event
  • For The Glory
  • Gettysburg
  • Hearts of Iron III
  • Heir to the Throne
  • Impire
  • Europa Universalis III Complete
  • King Arthur II
  • Knights of Pen and Paper +1 Edition
  • Lead and Gold
  • Legio
  • Europa Universalis IV: Conquest of Paradise
  • The Kings Crusade
  • Lost Empire - Immortals
  • Magicka
  • Majesty 2 Collection
  • March of the Eagles
  • Europa Universalis III Complete
  • Naval War: Arctic Circle
  • Pirates of Black Cove
  • Europa Universalis IV: Res Publica
  • Europa Universalis: Rome
  • Rome Gold
  • Crusader Kings III
  • Crusader Kings II: Sunset Invasion
  • Ancient Space
  • Arsenal of Democracy
  • Hearts of Iron II: Armageddon
  • Cities in Motion
  • Cities in Motion 2
  • Crusader Kings II
  • Crusader Kings II: Charlemagne
  • Crusader Kings II: Legacy of Rome
  • Crusader Kings II: The Old Gods
  • Crusader Kings II: Rajas of India
  • Crusader Kings II: The Republic
  • Crusader Kings II: Sons of Abraham
  • A Game of Dwarves
  • Crusader Kings II: Sword of Islam
  • Commander: Conquest of the Americas
  • Darkest Hour
  • Dungeonland
  • East India Company Collection
  • Europa Universalis III
  • Europa Universalis III: Chronicles
  • Europa Universalis III Complete
  • Divine Wind
  • Europa Universalis IV
Please try a **clean** reinstall:

- Remove the game from Steam (uninstall)
- Manually delete all these files and folders, if still there:

~/Library/Application Support/Steam/SteamApps/common/Cities_Skylines/
~/Library/Application Support/Steam/userdata/<SteamID>/255710/
~/Library/Application Support/Steam/SteamApps/workshop/content/255710/
~/Library/Application Support/Colossal Order/Cities_Skylines/
(first move the /saves/ folder elsewhere to keep your save games)

- Install the game again and see if it runs now.

If that doesn't help, Please attach this log file here:

To find that file, in Finder do cmd-shift-G to bring up the GOTO box. In there paste ~/Library/ . You will see a /Logs/ folder, and inside that /Unity/ folder. Please attach that file player.log here by dropping it on this support ticket, or use the "Attach file" link here.

Also in Steam please click on Steam-Help-System Info, and paste everything there into a text file and attach that here.