1. Do you need support for Assetto Corsa Competizione? Please use the proper forum below and ALWAYS zip and attach the WHOLE "Logs" folder in your c:\users\*youruser*\AppData\Local\AC2\Saved. The "AppData" folder is hidden by default, check "Hidden items" in your Windows view properties. If you report a crash, ALWAYS zip and attach the WHOLE "Crashes" folder in the same directory.
  2. FOR ASSETTO CORSA COMPETIZIONE: If you report issues with saved games, please always zip and attach your entire User/Documents/Assetto Corsa Competizione/Savegame folder!
  3. If your game executable is missing, please add your entire Steam directory to the exceptions in your antivirus software, then run a Steam integrity check or reinstall the game altogether.

AC Troubleshooting

Game doesn't start when click "START ENGINE"

Please be sure that your video drivers are updated and double check the resolution/refresh in the video options.

kernelbase.dll error on Windows 10

Solution from user Trystan34:

I somehow managed to fix the game. It finally launches!

I don't know which of the following actually events fixed it though. I think it may be the new account creation though.

I researched into "KERNELBASE.dll" error and found that users were experiencing issues due to account names or something.

The events that took place after researching:

  • Changed "Computer Name" (By default Windows 10 installed without asking me what I wanted the computers name to be)
  • I created a new User Account and made it an Administrative account and then restarted pc
  • Logged into the new account and installed Steam. (It started deleting cache files from the Steam install on my external HDD, I then installed Steam on C Drive)
  • Logged into Steam went to Assetto Corsa -> opened directory and and made AssettoCorsa.exe "Run as administrator" and then... IT LAUNCHED!
I then logged back into main Windows account and tried to run the game and it worked too. I then deleted the second Windows account and restarted pc. Once logged back in, tried running it once more and it worked again.

My progress and AC settings were deleted after update!

You can find automatic backups of the laptime database, livery selections and favourites in userdocs\Assetto Corsa\launcherdata\backups - if they were created they will be in directories with a "<DATE>-<TIME>" format, copy the contents of one of those dirs back in to the "userdocs\Assetto Corsa\launcherdata" directory.

We do not reset the documents folder automatically unless a major version change has occurred and then a version mismatch message will appear when you launch the game stating exactly what will occur and allowing you to not go through with the process giving you the chance to make a backup. That said, there was no major version change with this update.

What controls the version update is in launcher.ini:
The launcher.ini that is in the installation directory cfg folder has to match the version of the one in the userdocs folder - if that is not the case, you will get the version mismatch error.

Can I play with a DirectX10 graphics card?

As reported in the "minimum requirements" on the Steam page, in the FAQ and on the official website, Assetto Corsa doesn't support DirectX 10.0 cards and will never do, due to technical factors.

Users with DIRECTX 10.0 video cards will not receive any support.

User Interface too large!

If you cannot scroll down to the options button to go to "Options>General" and then check "Ignore Windows' display-scaling settings" (you need to restart the launcher for it to take effect), you can edit your "launcher.ini" found in "<UserDocuments>\Assetto Corsa\cfg" and add IGNOREDPI=1 under the [WINDOW] section.

The game doesn't start at all when launched

  • Make sure the pre-requisite libraries have installed properly, you can find them by right-clicking on Assetto Corsa in Steam then "Local Files" -> "Browse Local Files...". Navigate to the "_commonredist" folder and run the setup for all the included redistributables. Pay attention to any error messages you might get and make sure no antivirus or such software blocks their installation. These are normally installed automatically on first run, but occassionally they will output errors which are not reported to you by Steam;
  • Use Steam's cache integrity check. Open your Steam games library, right click on Assetto Corsa and select "Properties". Click "local files" and then "verify integrity of Game cache";
  • Check your installed Windows updates. If you have the KB2670838 update, please uninstall it and try if the game starts properly.

I get a crash while playing and a system reboot, don't know what causes it!

You're likely getting a blue screen and have windows set to auto-reboot on such (you can disable that to see the stop error by pressing Win-Break, go to "Advanced"->"Startup and Recovery Settings" and under "system failure" uncheck "Automatically restart").

Regardless if you disable autorestart or not, to see which driver component is causing it, you can get bluescreenview:

It'll go through the minidumps windows have recorded and it'll report the component at fault.

.NET 4.0 not installing and returns a 0xc8000222 error if invoked manually

You can find the installable by right-clicking on Assetto Corsa in Steam then "Local Files" -> "Browse Local Files..." and navigating to the _CommonRedist\DotNet\4.0 folder

Before installing .NET Framework 4.0 by running dotNetFx40_Full_x86_x64.exe:
  1. Press your Win key and type cmd, then right click on the result and select "run as administrator"
  2. Once in the command prompt type in command "net stop WuAuServ" to disable windows update
  3. Then press Win+R and type in "%windir%" at the pop-up window, it will take you to your windows installation folder
  4. Find the folder "SoftwareDistribution" and rename it to "SoftwareDistribution.old"
  5. Then, go back your previous command prompt and run the command "net start WuAuServ" to restart windows update
  6. Finally try again to install .NET Framework

Grey screen after introduction

  • Press F11. This will make the game's launcher exit full screen;
  • In some configurations it has been reported that setting "AssettoCorsa.exe" to run as administrator worked to by-pass this issue.

The UIAutomationCore.dll error

  • Check that these files exist:

    If not goto:

    From there... Copy/Paste the "UIAutomationCore.dll" to "System32" directory.

    Optional, only if ac doesn't start after copying the files.
    Then open a cmd and run as admin then type without quotes "cd C:\Windows\System32"
    Press enter.
    Then type exactly as below:
    regsvr32 UIAutomationCore.dll
    And do the same for the one below.

    If not there goto:

    From there... Copy/Paste the"UIAutomationCore.dll" to "SysWOW64" directory

    Again optional, only if ac doesn't start after copying the files.
    Open another cmd and run as admin then type without quotes "cd C:\Windows\SysWOW64"
    Press enter.
    Then type exactly as below:
    regsvr32 UIAutomationCore.dll

  • Some users have reported that they cannot start the sim if their main audio device is disabled. Obviously, enabling it solves this issue.
  • The windows firewall dialog might be requesting access for acs.exe - accepting the rule exception addition can solve this. If the dialog doesn't show up, you might have to go through the windows control panel options for the firewall and set it to allow acs.exe
As always for issues not mentioned here please search first for previous mentions and then start a different thread. You will likely be asked to include the log files from "My Documents\Assetto Corsa\logs" - the best way to do this is to right click on the logs folder and create a zip archive* which you can upload here.

* in Windows by default this is done by right clicking on the "folder->send to->compressed (zipped) folder"

Black or white screen in AC launcher

  • In Steam right click on Assetto Corsa, go to "Properties" and "Set Launch Options..." and add "/soft". This causes your launcher to resort to software mode. There UI might be sluggish and some artifacts may appear, but it will at least be functional until we can find a proper fix.
If you are running a dual GPU system and encounter a full black screen in the launcher then make sure that AssettoCorsa.exe is assigned to the GPU your desktop is using and acs.exe is assigned to your "high performance" GPU. This can be done in the nvidia control panel for nvidia users and in the Catalyst Control Center for ATI/AMD users.

My modded content doesn't work anymore!

After every official update, it happens that some addon content is not compatible anymore. This is part of development and bug fixing. Improvements for the vanilla game could break some 3rd party addons, so it's up to the modders making their work compatible again with the latest AC version available.

RadeonPro, MSI Afterburner or similar profiling/overlaying software

  • Make sure it targets "acs.exe", not "AssettoCorsa.exe", this is only the launcher of the game.

AC doesn't start /// I have stuttering issues!

Sometimes stuttering could simply be related to too high graphics quality settings in game. Try lowering step by step your video settings until you achieve a solid frame rate.
If the issue is still present, thank to users feedbacks we have found some scenarios that can cause stuttering:

- Addon in-game apps
- Messed up config files
- Video overlay software (MSI Afterburner, Fraps, Aida64, Gpu-z and similar)
- 3rd party graphics tools (nVidia Inspector, Ati Tray Tools, SweetFX, Ati RadeonPro and similar)
- Background monitoring (Cpu-Z, Gpu-Z, Aida64, Intel Overclocking utility and similar)
- Controller emulation software and hardware (not original x360 gamepads, motionjoy software and similar)
- Antivirus / Firewall wrong configurations
- X-fire software

As you can see, it's plenty of potential causes that can generate stuttering in Assetto Corsa (and any other game!). So, before writing a new thread or post, please check by yourself your PC overall status.
FAQ Manager ©2019 Iversia from RPGfix.
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