Datapack Load Error Fix is a lightweight utility mod designed to help players continue using their Minecraft worlds after removing mods.

When mods that add custom dimensions, entities, or blocks are uninstalled, they often leave behind data references that can cause world loading errors or in-game crashes.

This mod automatically detects and cleans up these invalid references, allowing your world to load normally again.

This mod provides a permanent fix; you can repair the save file directly in the editor, and then delete this mod, but you may still keep it for future needs;

Currently, this mod only supports repairing on the client side. To repair a server save file, import it to the client and load the save once;

This mod is not a universal solution—it only fixes the data pack error that prevents entering a save caused by removing mods with custom dimensions. It cannot fix data pack errors caused by other reasons!

Datapack Load Error Fix

A comprehensive Minecraft world repair utility that fixes common issues caused by removed mods and datapacks.

Overview

Datapack Load Error Fix is a lightweight utility mod designed to help players recover and continue using their Minecraft worlds after removing mods. When mods that add custom dimensions, entities, or blocks are uninstalled, they often leave behind data references that can cause world loading errors or in-game crashes. This mod automatically detects and cleans these invalid references, allowing your worlds to load properly again.

Features

• Dimension Data Cleanup: Removes references to dimensions from uninstalled mods in level.dat files
• Entity Cleanup: Scans and removes entities from removed mods in region files
• Block Entity Repair: Identifies and removes tile entities (like machines, chests, etc.) from uninstalled mods
• Non-Intrusive Operation: Works silently in the background when a world is loaded
• Automatic Backups: Creates backups of modified files for safety

How It Works

When you load a world, the mod automatically:

1. Scans your level.dat file for dimension references
2. Checks region files for entities and block entities
3. Compares found references against your currently installed mods
4. Removes any references to mods that are no longer present
5. Creates backups of any modified files

Usage

This module provides a permanent fix. You can repair your save file via editing it with this module, after which you can uninstall the module if you wish, though you're also free to keep it.

For advanced users, detailed logs are available showing exactly what was removed or modified.

Common Issues Fixed

• "Failed to load level.dat" errors after removing dimension mods
• Crashes when entering areas with entities from removed mods
• Performance issues caused by invalid entity references
• Missing blocks or corrupted chunks from uninstalled content mods

Compatibility

Compatible with most Minecraft Forge versions. Does not modify gameplay mechanics or add any in-game content, making it compatible with virtually all other mods.

Note: Always back up your worlds before using any repair tools, even though this mod creates its own backups automatically.