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Calamity biome chest error: Quick Fix

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  • 3 min read

Terraria is a rather popular 2D action-adventure game that’s quite popular in the indie gaming and modding communities. Although there are some differences, the game is quite similar to Minecraft in terms of how the player goes around the world building, crafting and fighting different enemies. 

The game is also rather easy to mod and has hundreds if not thousands of mods that add to the already expansive gameplay. In this article, we’re talking about Calamity, a mod for the game that adds many hours of endgame content and dozens of enemies and bosses to the game. 

Also read: How to fix Steam error: This item is currently unavailable in your region?

Why does this error happen?

There isn’t a specific reason for this error. There are multiple things that can trigger the issue including

  • Faulty update to the mod. 
  • Corrupt game files. 
  • Improper installation. 

How to fix this?

Here are three fixes you can try out. 

Update Calamity Mod and Terraria 

The first thing you should do is update both the Calamity Mod and Terraria in case there are any updates available for either or both of them. There’s a good chance that the developers have fixed the issue on their end and have pushed a patch to address the issue among the player base. 

Check the integrity of Steam game files 

Luckily, Steam has a built-in feature that verifies your game files and reinstalls any files that might be damaged. Follow these steps.

Step 1: Head over to your Steam Library, right-click on Terraria and select Properties.

How to fix the 'VAC was unable to verify your game session' error?

Step 2: Head over to the Local Files tab.

How to fix the 'VAC was unable to verify your game session' error?

Step 3: Click on Verify integrity of local files… and let Steam do its thing. 

How to fix the 'VAC was unable to verify your game session' error?

Now run the game again and it should be running all right. 

Reinstall Terraria and Calamity Mod

If the aforementioned fixes don’t work, your best bet is to reinstall the game and the mod individually from scratch. Make sure to first uninstall the Calamity Mod, then the game. That way you’ll get a clean uninstall. Once you’re sure all instances and game-related files are deleted, do the same for the mod and then reinstall them both. 

Also read: Minecraft error code -1: 5 Fixes


Yadullah Abidi

Yadullah is a Computer Science graduate who writes/edits/shoots/codes all things cybersecurity, gaming, and tech hardware. When he's not, he streams himself racing virtual cars. He's been writing and reporting on tech and cybersecurity with websites like Candid.Technology and MakeUseOf since 2018. You can contact him here: