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Crashed on startup with 1.20.1/The game crashed whilst initializing game Error: java.util.ConcurrentModificationException: null

Kiuser
in Support & Bug Reports

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https://forums.minecraftforge.net/topic/153158-crashed-on-startup-with-1201the-game-crashed-whilst-initializing-game-error-javautilconcurrentmodificationexception-null/
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