warningJava ErrorsAffects: All versions
How to Fix java.lang.ClassCastException
Fix ClassCastException in Minecraft by resolving mod version mismatches and removing conflicting mods.
Quick Fix
Ensure all mods are compiled for the same Minecraft and mod loader version.
Error Message
java.lang.ClassCastException: class X cannot be cast to class YHow to Fix
1
Verify all mods target the same Minecraft version
2
Update the mod loader (Forge/Fabric/NeoForge) to the latest version
3
Remove one of the conflicting mods
4
Check for known mod incompatibilities on the mod pages
Common Causes
- Two mods providing conflicting implementations of the same class
- Mod compiled for a different Minecraft version
- Mixin conflict between mods
- Incorrect mod loader version
Diagnostic Steps
- Read the ClassCastException message to identify the two conflicting classes
- Find which mods provide those classes
- Check both mods' compatibility notes
- Remove one or find a compatibility patch
FAQ
What does ClassCastException mean in Minecraft?
Two mods are trying to treat the same thing as different types. Usually a version mismatch or mod conflict.