Troubleshooting mod conflicts

When mods don't play nice together, your server might crash or behave unexpectedly. Here's how to identify and fix mod conflicts.

Signs of mod conflicts

• - Server crashes on startup
• - Server crashes when using specific items or commands
• - Features from one mod stop working after adding another
• - Error messages mentioning specific mod names in the console
• - Unexpected behavior (items acting wrong, commands not working)

Finding the problem mod

Method 1: Check the console

The console often tells you exactly which mod is causing issues:

1. 1. Go to the Console tab
2. 2. Look for lines containing ERROR, WARN, or Exception
3. 3. Error messages usually include the mod name in the stack trace

Method 2: Binary search

If the console doesn't clearly identify the problem:

1. 1. Disable half of your mods
2. 2. Restart and test
3. 3. If the problem persists, it's in the enabled half
4. 4. If the problem is gone, it's in the disabled half
5. 5. Repeat until you narrow it down to one or two mods

Method 3: Recent additions

If problems started after installing new mods:

1. 1. Disable the most recently added mods
2. 2. Test if the problem is resolved
3. 3. Re-enable mods one at a time to find the culprit

Common conflict types

Duplicate functionality

Two mods doing the same thing often conflict. For example, two economy plugins or two teleportation mods might fight over the same commands or data.

Fix: Choose one mod for each feature and remove duplicates.

Version mismatches

Mods built for different game versions may not work together.

Fix: Ensure all mods support your exact game version.

Missing dependencies

Some mods require other mods to work (like library mods or APIs).

Fix: Read the mod's requirements and install all dependencies.

Load order issues

Some mods need to load before others. This is especially common with modloaders like Forge.

Fix: Check mod documentation for load order requirements.

Resolving conflicts

• - Update mods: Often the latest versions fix known compatibility issues
• - Check compatibility lists: Many mods document known conflicts
• - Look for patches: Some developers release compatibility patches
• - Choose alternatives: Replace problematic mods with compatible alternatives
• - Ask the community: Check mod forums or Discord servers for solutions

Preventing future conflicts

• - Create a backup before adding new mods
• - Add one mod at a time and test each
• - Read mod descriptions for compatibility notes
• - Stick to well-maintained, popular mods when possible
• - Keep mods updated