Error When Spawn Mobs [With Disguise 9.0.7]

Hello guys ! Can some one tell me the reason when i spawn my custom mobs [With Disguise Setting {Skin}]
It kick me out of my server and i can't join again.
It is what Console said:
[01:44:14 INFO]: java.lang.ClassNotFoundException: net.minecraft.server.v1_9_R2.EnumGamemode [01:44:14 INFO]: at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:91) [01:44:14 INFO]: at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:86) [01:44:14...

Error When Spawn Mobs [With Disguise 9.0.7]