Mod Crash / Mod Incompatibility
Mojang Minecraft
Severity: ModerateWhat Does This Error Mean?
A mod crash means one of your installed mods is incompatible, corrupted, or conflicts with another mod. The crash log identifies the failing mod. Remove mods one at a time to find the culprit.
Affected Models
- Minecraft Java Edition
- PC
- macOS
- Linux
Common Causes
- Mod version does not match Minecraft version
- Two mods conflicting with each other
- Missing dependency mod (library mod required)
- Corrupted mod file download
- Forge/Fabric version mismatch
How to Fix It
-
Check the crash log for the mod name.
Open .minecraft/crash-reports/latest.txt. Search for the mod name in the stack trace.
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Remove the last mod you added and test.
If the game works without it, that mod is the problem.
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Check mod version compatibility.
Each mod specifies which Minecraft version it supports. A mod for 1.20 will not work on 1.21.
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Install required dependency mods.
Many mods require library mods (Fabric API, Architectury, etc.). Check the mod's page for required dependencies.
Frequently Asked Questions
How do I know which mods conflict?
Remove half your mods and test. If it works, the problem is in the removed half. Keep halving until you find the specific mod. This binary search is faster than one-by-one.
Can Forge and Fabric mods work together?
No. Forge and Fabric are different mod loaders. Mods made for one do not work with the other. Pick one loader and use only compatible mods.