[10:01:53] [Server thread/ERROR]: Could not pass event GMUserEvent to EnjinMinecraftPlugin v2.6.0
org.bukkit.event.EventException
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:294) ~[spigot.jar:git-Spigot-1495]
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot.jar:git-Spigot-1495]
	at org.bukkit.plugin.TimedRegisteredListener.callEvent(TimedRegisteredListener.java:47) ~[spigot.jar:git-Spigot-1495]
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [spigot.jar:git-Spigot-1495]
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [spigot.jar:git-Spigot-1495]
	at org.anjocaido.groupmanager.events.GMUserEvent$1.run(GMUserEvent.java:82) [EssentialsGroupManager.jar:?]
	at org.bukkit.craftbukkit.v1_7_R3.scheduler.CraftTask.run(CraftTask.java:67) [spigot.jar:git-Spigot-1495]
	at org.bukkit.craftbukkit.v1_7_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:345) [spigot.jar:git-Spigot-1495]
	at net.minecraft.server.v1_7_R3.MinecraftServer.v(MinecraftServer.java:635) [spigot.jar:git-Spigot-1495]
	at net.minecraft.server.v1_7_R3.DedicatedServer.v(DedicatedServer.java:283) [spigot.jar:git-Spigot-1495]
	at net.minecraft.server.v1_7_R3.MinecraftServer.u(MinecraftServer.java:583) [spigot.jar:git-Spigot-1495]
	at net.minecraft.server.v1_7_R3.MinecraftServer.run(MinecraftServer.java:489) [spigot.jar:git-Spigot-1495]
	at net.minecraft.server.v1_7_R3.ThreadServerApplication.run(SourceFile:628) [spigot.jar:git-Spigot-1495]
Caused by: java.lang.NoSuchMethodError: org.anjocaido.groupmanager.data.User.getUUID()Ljava/lang/String;
	at com.enjin.officialplugin.permlisteners.GroupManagerListener.userGroupChangeListener(GroupManagerListener.java:29) ~[?:?]
	at sun.reflect.GeneratedMethodAccessor252.invoke(Unknown Source) ~[?:?]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_05]
	at java.lang.reflect.Method.invoke(Method.java:483) ~[?:1.8.0_05]
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:292) ~[spigot.jar:git-Spigot-1495]
	... 12 more