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Internal Exception: java.lang.IllegalArgumentException: Registry ResourceKey[minecraft:root / apoli:configured_entity_condition] was missing

java.lang.ClassCastException: class net.minecraft.server.network.ServerLoginPacketListenerImpl cannot be cast to class net.minecraft.network.protocol.login.ClientLoginPacketListener ...
TWCN Tech News

Fix Internal Exception Java.IO.IOException Minecraft problem

Some Minecraft users see an error message saying Connection Lost, Internal Exception: java.io.IOException, An existing connection was forcibly closed by the remote ...
GitHub

Internal Exception: java.util.ConcurrentModificationException

java.lang.ClassCastException: class net.minecraft.server.network.ServerGamePacketListenerImpl cannot be cast to class net.minecraft.network.protocol.game.ClientGamePacketListener (net.minecraft.server ...