java.lang.NoSuchMethodError
NoSuchMethodError happens when one mod calls a method that another mod (or the Minecraft codebase itself) used to have but doesn't anymore. It's almost always a mod-version mismatch in a modpack: two mods were bumped against different versions of a shared dependency.
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How to fix it
- 1
Find the missing method in the trace
The crash report names the exact method that's missing. It usually looks like net.minecraft.world.level.Level.m_46472_() — the m_xxxx_ form is the obfuscated MC method name. Note which mod's class is doing the calling (the at-line above the error).
- 2
Reinstall the modpack from a clean source
If your pack worked before, one of the mods auto-updated to a version that broke the API contract. Wipe mods/ and reinstall the pack from the launcher to restore the matched mod set.
- 3
Update only the calling mod, not the one with the method
If reinstalling isn't an option, look at which mod is doing the call (top of the stack trace) and check its CurseForge / Modrinth page for a newer version that targets the API surface your pack actually has.
- 4
Skip downgrading the called mod
It's tempting to downgrade Create or Architectury to the version the older mod expects, but that almost always breaks something else. Update the caller first.
Alternative causes
These can produce the same error message — worth ruling out if the steps above don't resolve it.
Server mod set != client mod set
Players see the crash when they join because the server is running version X of a mod and the client is running version Y. Pin both ends to the same modpack release.
Old world built against an old mod build
A world that loaded fine against mod v1.0.0 can throw NoSuchMethodError after the pack updates to v1.5.0 if a block entity persists state that references a now-removed method.
Frequently asked
Is NoSuchMethodError ever caused by a missing mod?
Sometimes — if the called method lives in a library mod that didn't load, the symptom looks identical. Check whether the calling mod's mandatory-dependency list is satisfied in mods/.
Will players' clients crash too?
On vanilla join, usually no — the server will reject them with a 'class missing' message. On Forge/Fabric with client-side mods sharing the same code, yes.
How do I find out which mod is missing the method?
Look at the at-line directly above the NoSuchMethodError in the crash report. That mod is the caller. The method's package (net.minecraft… vs com.somebody.modname) tells you where the method should be defined.
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Last reviewed 2026-06-05. If a step is wrong or out of date, tell us — we'll fix the article and the auto-pattern at the same time.