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java.lang.NullPointerException: 	at com.gmail.gaelitoelquesito.CustomNoteBlock.Disco.BallEvent.click(BallEvent.java:22)	at sun.reflect.GeneratedMethodAccessor82.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:300)	at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:78)	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:517)	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:502)	at org.bukkit.craftbukkit.v1_9_R1.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:227)	at org.bukkit.craftbukkit.v1_9_R1.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:194)	at net.minecraft.server.v1_9_R1.BlockRedstoneOre.stepOn(BlockRedstoneOre.java:38)	at net.minecraft.server.v1_9_R1.Entity.move(Entity.java:774)	at net.minecraft.server.v1_9_R1.PlayerConnection.a(PlayerConnection.java:514)	at net.minecraft.server.v1_9_R1.PacketPlayInFlying.a(SourceFile:126)	at net.minecraft.server.v1_9_R1.PacketPlayInFlying$PacketPlayInPosition.a(SourceFile:57)	at net.minecraft.server.v1_9_R1.PlayerConnectionUtils$1.run(SourceFile:13)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)	at java.util.concurrent.FutureTask.run(FutureTask.java:266)	at net.minecraft.server.v1_9_R1.SystemUtils.a(SourceFile:45)	at net.minecraft.server.v1_9_R1.MinecraftServer.D(MinecraftServer.java:775)	at net.minecraft.server.v1_9_R1.DedicatedServer.D(DedicatedServer.java:404)	at net.minecraft.server.v1_9_R1.MinecraftServer.C(MinecraftServer.java:714)	at net.minecraft.server.v1_9_R1.MinecraftServer.run(MinecraftServer.java:613)	at java.lang.Thread.run(Thread.java:745)