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java.lang.NullPointerException: 	at net.minecraft.server.v1_11_R1.EntityItemFrame.setItem(EntityItemFrame.java:118)	at net.minecraft.server.v1_11_R1.EntityItemFrame.setItem(EntityItemFrame.java:114)	at org.bukkit.craftbukkit.v1_11_R1.entity.CraftItemFrame.setItem(CraftItemFrame.java:53)	at me.Fupery.ArtMap.Easel.Easel.removeItem(Easel.java:206)	at me.Fupery.ArtMap.Easel.EaselEvent.callEvent(EaselEvent.java:57)	at me.Fupery.ArtMap.Listeners.PlayerInteractEaselListener.callEaselEvent(PlayerInteractEaselListener.java:105)	at me.Fupery.ArtMap.Listeners.PlayerInteractEaselListener.onPlayerInteractAtEntity(PlayerInteractEaselListener.java:35)	at sun.reflect.GeneratedMethodAccessor753.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:302)	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502)	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487)	at net.minecraft.server.v1_11_R1.PlayerConnection.a(PlayerConnection.java:1518)	at net.minecraft.server.v1_11_R1.PacketPlayInUseEntity.a(SourceFile:69)	at net.minecraft.server.v1_11_R1.PacketPlayInUseEntity.a(SourceFile:13)	at net.minecraft.server.v1_11_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_11_R1.SystemUtils.a(SourceFile:46)	at net.minecraft.server.v1_11_R1.MinecraftServer.D(MinecraftServer.java:739)	at net.minecraft.server.v1_11_R1.DedicatedServer.D(DedicatedServer.java:399)	at net.minecraft.server.v1_11_R1.MinecraftServer.C(MinecraftServer.java:675)	at net.minecraft.server.v1_11_R1.MinecraftServer.run(MinecraftServer.java:574)	at java.lang.Thread.run(Thread.java:745)