AncientGates v1.8.0

[18:15:38] [Server thread/ERROR]: Could not pass event PlayerMoveEvent to AncientGates v1.8.0
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:427) ~[spigot.jar:git-Spigot-1228]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot.jar:git-Spigot-1228]
        at org.bukkit.plugin.TimedRegisteredListener.callEvent(TimedRegisteredListener.java:30) ~[spigot.jar:git-Spigot-1228]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:482) [spigot.jar:git-Spigot-1228]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:467) [spigot.jar:git-Spigot-1228]
        at net.minecraft.server.v1_7_R1.PlayerConnection.a(PlayerConnection.java:228) [spigot.jar:git-Spigot-1228]
        at com.bergerkiller.bukkit.common.internal.network.CommonPacketHandler$CommonPlayerConnection.a(CommonPacketHandler.java:280) [BKCommonLib-1.57.jar:?]
        at net.minecraft.server.v1_7_R1.PacketPlayInFlying.a(SourceFile:137) [spigot.jar:git-Spigot-1228]
        at net.minecraft.server.v1_7_R1.PacketPlayInLook.handle(SourceFile:98) [spigot.jar:git-Spigot-1228]
        at net.minecraft.server.v1_7_R1.NetworkManager.a(NetworkManager.java:147) [spigot.jar:git-Spigot-1228]
        at net.minecraft.server.v1_7_R1.ServerConnection.c(SourceFile:134) [spigot.jar:git-Spigot-1228]
        at net.minecraft.server.v1_7_R1.MinecraftServer.u(MinecraftServer.java:657) [spigot.jar:git-Spigot-1228]
        at net.minecraft.server.v1_7_R1.DedicatedServer.u(DedicatedServer.java:273) [spigot.jar:git-Spigot-1228]
        at net.minecraft.server.v1_7_R1.MinecraftServer.t(MinecraftServer.java:540) [spigot.jar:git-Spigot-1228]
        at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java:446) [spigot.jar:git-Spigot-1228]
        at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:617) [spigot.jar:git-Spigot-1228]
Caused by: java.lang.IllegalArgumentException: Cannot spawn an entity for io.github.dsh105.echopet.entity.living.type.enderdragon.CraftEnderDragonPet
        at org.bukkit.craftbukkit.v1_7_R1.CraftWorld.spawn(CraftWorld.java:1032) ~[spigot.jar:git-Spigot-1228]
        at org.bukkit.craftbukkit.v1_7_R1.CraftWorld.spawn(CraftWorld.java:797) ~[spigot.jar:git-Spigot-1228]
        at org.mcteam.ancientgates.util.TeleportUtil.teleportPlayer(TeleportUtil.java:81) ~[?:?]
        at org.mcteam.ancientgates.listeners.PluginMovementListener.onPlayerMove(PluginMovementListener.java:105) ~[?:?]
        at sun.reflect.GeneratedMethodAccessor188.invoke(Unknown Source) ~[?:?]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_45]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0_45]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:425) ~[spigot.jar:git-Spigot-1228]
        ... 15 more