How to Fix Baldur’s Gate 3 GustavDev Error

Are you struggling to enjoy Baldur’s Gate 3 due to the frustrating GustavDev Error? This unexpected glitch can derail your progress, disrupt multiplayer experiences, and generally sour your adventures in the Forgotten Realms.

If you’re ready to troubleshoot and reclaim the fun, this article breaks down the causes and solutions to get you back into your game.

So, what exactly is the GustavDev Error in BG3?

Fix Baldur's Gate 3 GustavDev Error

Have you seen this error code appear on your computer screen recently while playing BG3?

“Connection failed: Mod ‘GustavDev’ and/or its dependencies don’t match the server’s. This can be caused by corrupt files or files that have been changed.”

The only thing scarier than facing a Mind Flayer in Baldur’s Gate 3 is encountering dreaded errors for which you have no clue why they’re happening during gameplay.

There are many reasons why an error might appear while playing Baldur’s Gate 3, be that a bug in the game, a technical glitch with your gaming setup, or conflicts with mods you’ve installed.

Suggested: Baldur’s Gate 3 mods not working

The reason behind the Baldur’s Gate 3 GustavDev Error most likely stems from incompatible mods.

If you have installed a mod that is not compatible, no longer compatible, or was installed before a game update, you might see this error.

It could also be caused by conflicts between mods or issues with your BG3 mod manager.

How to Fix GustavDev Error in Baldur’s Gate 3

BG3 GustavDev Error message

Now that you know why the BG3 GustavDev error happens, you can follow this troubleshooting guide to fix the problem:

Correct BG3 Mod Settings

If you are using a BG3 mod manager (which is probably the best way to add mods to this game), remember to add your game installation directory to the settings.

Once added, click on the ‘Export to Game’ option. This will export all the mods to the game.

Play BG3 and see if the Gustav notification appears again.

Disable Mods One by One Until You Find the Culprit

Chances are high that the GustavDev error might be appearing due to some broken mods installed on your computer.

Try disabling installed mods one by one and checking the game. When you find the culprit, delete it and install an alternative.

Furthermore, please do remove any outdated mods using your mod manager; sooner or later, they might break your game.

Delete All Mods, Clean Install, and Re-Install

When nothing else works, try this as a last resort. Remember, you not only have to uninstall the game itself but also the save file directory.

You can find both the installation directory and save file location from the BG3 launcher.

Here’s how this process goes:

  1. Launch your BG3 mod manager and delete all of your installed mods.
  2. Once you delete all mods, hit save in the mod manager.
  3. Now launch the BG3 launcher. Use it to identify the path of the data folder. Note down that path.
  4. Uninstall the game (you can use Steam). If you have a backup, you can use that to replace the game files.
  5. Now go to the data folder location noted in step 3.
  6. Delete the ‘Larian Studios’ folder.
  7. Reboot your PC.

Once these steps are done, you can re-install the game and the mods you need one by one.

But do not install mods that haven’t been updated since the last game update, or the issue might reappear.

Suggested: How to Mod Baldur’s Gate 3

Tips to Avoid This in the Future

  • Keep a Separate Backup of Your Game: Before modding, always create a backup of your BG3 installation directory. If you encounter modding conflicts, delete the current directory and replace it with the backup.
  • Don’t Install Mods That Do the Same Thing: Installing mods that edit the same files is simply inviting various errors.
  • Make Sure Mods Are Compatible With the Game: BG3 developers are constantly updating the game. As a result, a mod that isn’t updated accordingly might not function properly, or worse, could break your game. Always check the mod description to ensure it’s compatible with the current game version.

Rahul Bodana passionately shares knowledge through tutorials on programming, investment, trading, gaming, and writing, aiming to empower others with valuable insights and how-to guides.