[21:04:51 ERROR]: Exception stopping the server
java.lang.AbstractMethodError: Receiver class de.marcely.bedwars.jU$1 does not define or inherit an implementation of the resolved method 'abstract void f(net.minecraft.world.entity.player.EntityHuman)' of interface net.minecraft.world.item.trading.IMerchant.
at net.minecraft.world.inventory.MerchantContainer.onClose(MerchantContainer.java:46) ~[?:?]
at net.minecraft.world.inventory.AbstractContainerMenu.transferTo(AbstractContainerMenu.java:81) ~[?:?]
at org.bukkit.craftbukkit.v1_18_R1.event.CraftEventFactory.handleInventoryCloseEvent(CraftEventFactory.java:1514) ~[paper-1.18.1.jar:git-Paper-167]
at net.minecraft.server.level.ServerPlayer.closeContainer(ServerPlayer.java:1575) ~[?:?]
at net.minecraft.server.players.PlayerList.remove(PlayerList.java:606) ~[paper-1.18.1.jar:git-Paper-167]
at net.minecraft.server.network.ServerGamePacketListenerImpl.onDisconnect(ServerGamePacketListenerImpl.java:1990) ~[?:?]
at net.minecraft.server.network.ServerGamePacketListenerImpl.disconnect(ServerGamePacketListenerImpl.java:461) ~[?:?]
at net.minecraft.server.players.PlayerList.removeAll(PlayerList.java:1359) ~[paper-1.18.1.jar:git-Paper-167]
at net.minecraft.server.MinecraftServer.stopServer(MinecraftServer.java:1048) ~[paper-1.18.1.jar:git-Paper-167]
at net.minecraft.server.dedicated.DedicatedServer.stopServer(DedicatedServer.java:800) ~[paper-1.18.1.jar:git-Paper-167]
at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1315) ~[paper-1.18.1.jar:git-Paper-167]
at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:317) ~[paper-1.18.1.jar:git-Paper-167]
at java.lang.Thread.run(Thread.java:833) ~[?:?]