19:44:37 [INFO] ** Leashing PIG to PLAYER
19:44:37 [INFO] ** Leashed: leashed
19:46:21 [SEVERE] Could not pass event BlockPlaceEvent to TestPlugin-LEASH_API v1.0
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:427)
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:462)
        at org.bukkit.craftbukkit.v1_6_R2.event.CraftEventFactory.callBlockPlaceEvent(CraftEventFactory.java:114)
        at net.minecraft.server.v1_6_R2.ItemBlock.processBlockPlace(ItemBlock.java:89)
        at net.minecraft.server.v1_6_R2.ItemBlock.interactWith(ItemBlock.java:73)
        at net.minecraft.server.v1_6_R2.ItemStack.placeItem(ItemStack.java:79)
        at net.minecraft.server.v1_6_R2.PlayerInteractManager.interact(PlayerInteractManager.java:389)
        at net.minecraft.server.v1_6_R2.PlayerConnection.a(PlayerConnection.java:628)
        at net.minecraft.server.v1_6_R2.Packet15Place.handle(SourceFile:58)
        at net.minecraft.server.v1_6_R2.NetworkManager.b(NetworkManager.java:296)
        at net.minecraft.server.v1_6_R2.PlayerConnection.e(PlayerConnection.java:116)
        at net.minecraft.server.v1_6_R2.ServerConnection.b(SourceFile:37)
        at net.minecraft.server.v1_6_R2.DedicatedServerConnection.b(SourceFile:30)
        at net.minecraft.server.v1_6_R2.MinecraftServer.t(MinecraftServer.java:590)
        at net.minecraft.server.v1_6_R2.DedicatedServer.t(DedicatedServer.java:226)
        at net.minecraft.server.v1_6_R2.MinecraftServer.s(MinecraftServer.java:486)
        at net.minecraft.server.v1_6_R2.MinecraftServer.run(MinecraftServer.java:419)
        at net.minecraft.server.v1_6_R2.ThreadServerApplication.run(SourceFile:582)
Caused by: java.lang.IllegalArgumentException: Cannot spawn an entity for org.bukkit.entity.Leash
        at org.bukkit.craftbukkit.v1_6_R2.CraftWorld.spawn(CraftWorld.java:1026)
        at org.bukkit.craftbukkit.v1_6_R2.CraftWorld.spawn(CraftWorld.java:792)
        at org.bukkit.craftbukkit.v1_6_R2.CraftWorld.spawnEntity(CraftWorld.java:339)
        at com.turt2live.bukkit.testing.leashapi.Main.onPlace(Main.java:95)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:425)
        ... 19 more
19:46:26 [INFO] turt2live issued server command: /lapi