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fabric-crash-debugging

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Diagnose and fix Minecraft Fabric crashes and load failures - reading crash reports and latest.log, Mixin errors (InvalidInjectionException, "could not find any targets", "@Redirect conflict", MixinApplyError), dependency and version resolution errors from Fabric Loader, client/server class-loading crashes (ClassNotFoundException, "invalid dist"), NoSuchMethodError/NoSuchFieldError from version mismatches, and Gradle/Loom build failures. Use whenever the user pastes a crash report, a stack trace, a log, or says the game or build crashes.

skills/fabric-crash-debugging/SKILL.md

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Last checked
Nov 6, 2026

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4
Repository last updated
Nov 2, 2026
License
MIT

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# Fabric crash debugging

Crashes are evidence. Read them in a fixed order and you will find the cause in the first 50
lines almost every time. Never "fix" a crash by guessing; locate the frame first.

## Where to look

| File | Contains |
|---|---|
| `run/crash-reports/crash-<date>-<side>.txt` (dev) / `.minecraft/crash-reports/` | Full crash report for crashes after the game started |
| `run/logs/latest.log` | Everything, including Loader resolution errors and mixin failures that happen *before* a crash report can be written |
| `run/logs/debug.log` | Same with debug level (if enabled) |
| `hs_err_pid*.log` in the run dir | **Native/JVM** crash (GPU driver, out of memory) - not a Java bug in your mod |
| Gradle output / `--stacktrace` | Build-time failures |
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