Description: Exception in server tick loop
java.lang.UnsupportedOperationException: null
	at java.util.AbstractList.add(AbstractList.java:148) ~[?:1.8.0_292] {}
	at java.util.AbstractList.add(AbstractList.java:108) ~[?:1.8.0_292] {}
	at com.song.castle_in_the_sky.events.ServerEvents.onVillageTradeRegister(ServerEvents.java:62) ~[castle_in_the_sky:1.16.5] {re:classloading}
	at net.minecraftforge.eventbus.ASMEventHandler_71_ServerEvents_onVillageTradeRegister_VillagerTradesEvent.invoke(.dynamic) ~[?:?] {}
	at net.minecraftforge.eventbus.ASMEventHandler.invoke(ASMEventHandler.java:85) ~[eventbus-4.0.0.jar:?] {}
	at net.minecraftforge.eventbus.EventBus.post(EventBus.java:302) ~[eventbus-4.0.0.jar:?] {}
	at net.minecraftforge.eventbus.EventBus.post(EventBus.java:283) ~[eventbus-4.0.0.jar:?] {}
	at net.minecraftforge.common.VillagerTradingManager.postVillagerEvents(VillagerTradingManager.java:92) ~[forge:?] {re:classloading}
	at net.minecraftforge.common.VillagerTradingManager.loadTrades(VillagerTradingManager.java:58) ~[forge:?] {re:classloading}
	at net.minecraftforge.eventbus.EventBus.doCastFilter(EventBus.java:247) ~[eventbus-4.0.0.jar:?] {}
	at net.minecraftforge.eventbus.EventBus.lambda$addListener$11(EventBus.java:239) ~[eventbus-4.0.0.jar:?] {}
	at net.minecraftforge.eventbus.EventBus.post(EventBus.java:302) ~[eventbus-4.0.0.jar:?] {}
	at net.minecraftforge.eventbus.EventBus.post(EventBus.java:283) ~[eventbus-4.0.0.jar:?] {}
	at net.minecraftforge.fml.server.ServerLifecycleHooks.handleServerAboutToStart(ServerLifecycleHooks.java:95) ~[forge:?] {re:mixin,re:classloading}
	at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:166) ~[?:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.server.MinecraftServer.func_240802_v_(MinecraftServer.java:621) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:betterendforge.mixins.json:MinecraftServerMixin,pl:mixin:APP:structure_gel.mixins.json:MinecraftServerMixin,pl:mixin:APP:upstream.mixins.json:MixinMinecraftServer,pl:mixin:APP:blame.mixins.json:MinecraftServerAccessor,pl:mixin:APP:globaldataandresourcepacks.mixins.json:MinecraftServerMixin,pl:mixin:APP:byg.mixins.json:server.MixinMinecraftServer,pl:mixin:APP:charm.mixins.json:accessor.MinecraftServerAccessor,pl:mixin:A,pl:runtimedistcleaner:A}
	at net.minecraft.server.MinecraftServer.func_240783_a_(MinecraftServer.java:232) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:betterendforge.mixins.json:MinecraftServerMixin,pl:mixin:APP:structure_gel.mixins.json:MinecraftServerMixin,pl:mixin:APP:upstream.mixins.json:MixinMinecraftServer,pl:mixin:APP:blame.mixins.json:MinecraftServerAccessor,pl:mixin:APP:globaldataandresourcepacks.mixins.json:MinecraftServerMixin,pl:mixin:APP:byg.mixins.json:server.MixinMinecraftServer,pl:mixin:APP:charm.mixins.json:accessor.MinecraftServerAccessor,pl:mixin:A,pl:runtimedistcleaner:A}
	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_292] {}