Wrong Minecraft version

NoSuchMethodError in a Minecraft class — mod built against another version

What the log looks like

nosuchmethoderror: *'?[^\n]{0,80}net[./]minecraft
nosuchfielderror[^\n]{0,80}net[./]minecraft
incompatibleclasschangeerror

How to fix it

  1. The method exists in one Minecraft version and not in yours
  2. Find which mod is in the stack trace above the error and update or downgrade it
  3. This also happens when two mods ship different versions of the same library
SeverityStops the game
CategoryWrong Minecraft version

Check your own log

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