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java.lang.reflect.InvocationTargetException: 	at sun.reflect.GeneratedMethodAccessor80.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at cn.nukkit.plugin.MethodEventExecutor.execute(MethodEventExecutor.java:25)	at cn.nukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:51)	at cn.nukkit.plugin.PluginManager.callEvent(PluginManager.java:568)	at cn.nukkit.entity.Entity.attack(Entity.java:644)	at cn.nukkit.entity.item.EntityBoat.attack(EntityBoat.java:85)	at cn.nukkit.Player.handleDataPacket(Player.java:2583)	at cn.nukkit.network.Network.processPackets(Network.java:193)	at cn.nukkit.network.Network.processBatch(Network.java:164)	at cn.nukkit.Player.handleDataPacket(Player.java:1789)	at cn.nukkit.network.RakNetInterface.handleEncapsulated(RakNetInterface.java:154)	at cn.nukkit.raknet.server.ServerHandler.handlePacket(ServerHandler.java:123)	at cn.nukkit.network.RakNetInterface.process(RakNetInterface.java:63)	at cn.nukkit.network.Network.processInterfaces(Network.java:75)	at cn.nukkit.Server.tick(Server.java:980)	at cn.nukkit.Server.tickProcessor(Server.java:781)	at cn.nukkit.Server.start(Server.java:761)	at cn.nukkit.Server.(Server.java:455)	at cn.nukkit.Nukkit.main(Nukkit.java:65)