How to Fix Diablo 3 Error Code 1

Diablo 3 is a popular and intense game that is very largely considered to be one of the most iconic of all time. However, there might be times when you may encounter an error code 1 that could spoil your gaming experience. The error code 1 can pop up on your screen due to various reasons including lack of administrative privileges or compatibility. If you just haven't gotten the chance to sign up for the Diablo 4 closed beta just yet, and are still experiencing this error code for Diablo 3, then keep on reading!

How to fix D3 Error Code 1

The following are all the possible ways to fix this error code if you happen to run into it:

1. Run as administrator
   • Right-click the Diablo.exe application.
   • Select the Run as Administrator option.
2. Update your graphics driver.
3. Run Diablo 3 in windowed mode
   • Right-click the .exe file located in the Diablo 3 file in the proper properties folder.
   • Add "-w" at the end of the Diablo.exe.
4. Disable antivirus/firewall
   • Add Diablo's main folder to the antivirus scan's exceptional list.
   • In the case of a firewall, temporarily turn it off for both private and public networks.

Related: How does Augmenting Ancient Items work in Diablo 3?

What causes error code 1 in Diablo 3?

As we mentioned above, there are a ton of potential reasons why you would be experiencing this problem. We recommend checking out whether or not these could be your problem before looking through the fixes above.

1. Lack of administrative privileges
   • If you haven't enabled Run as Administrator before launching the Diablo 3 application, the game may not have the necessary privileges to run smoothly in the background.
2. Firewall or antivirus interference
   • Your system's firewall or antivirus software may be interfering with the game's processes, causing the error code 1 to appear.
3. Compatibility issues
   • Compatibility issues between your system's operating system and the game's recommended operating system could be the reason behind the error code 1.
4. DNS issues
   • Sometimes, DNS issues may trigger error code 1.

For more on Diablo, check out Diablo 4 system requirements and How to play Diablo 4 Beta Early Access only on Pro Game Guides.