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java.lang.NullPointerException: 	at org.bukkit.inventory.ItemStack.(ItemStack.java:124)	at com.earth2me.essentials.utils.LocationUtil.convertBlockToItem(LocationUtil.java:88)	at com.earth2me.essentials.EssentialsBlockListener.onBlockPlace(EssentialsBlockListener.java:30)	at sun.reflect.GeneratedMethodAccessor155.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:497)	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306)