[SEVERE] Could not pass event EntityDamageByEntityEvent to AuraJoin v1.3
org.bukkit.event.EventException
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:294)
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
	at org.bukkit.plugin.TimedRegisteredListener.callEvent(TimedRegisteredListener.java:30)
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502)
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487)
	at org.bukkit.craftbukkit.v1_7_R2.event.CraftEventFactory.callEvent(CraftEventFactory.java:99)
	at org.bukkit.craftbukkit.v1_7_R2.event.CraftEventFactory.callEntityDamageEvent(CraftEventFactory.java:403)
	at org.bukkit.craftbukkit.v1_7_R2.event.CraftEventFactory.handleEntityDamageEvent(CraftEventFactory.java:430)
	at net.minecraft.server.v1_7_R2.EntityLiving.damageEntity(EntityLiving.java:663)
	at net.minecraft.server.v1_7_R2.EntityHuman.damageEntity(EntityHuman.java:751)
	at net.minecraft.server.v1_7_R2.EntityPlayer.damageEntity(EntityPlayer.java:467)
	at net.minecraft.server.v1_7_R2.EntityHuman.attack(EntityHuman.java:923)
	at net.minecraft.server.v1_7_R2.PlayerConnection.a(PlayerConnection.java:1144)
	at net.minecraft.server.v1_7_R2.PacketPlayInUseEntity.a(SourceFile:55)
	at net.minecraft.server.v1_7_R2.PacketPlayInUseEntity.handle(SourceFile:10)
	at net.minecraft.server.v1_7_R2.NetworkManager.a(NetworkManager.java:148)
	at net.minecraft.server.v1_7_R2.ServerConnection.c(ServerConnection.java:77)
	at net.minecraft.server.v1_7_R2.MinecraftServer.v(MinecraftServer.java:703)
	at net.minecraft.server.v1_7_R2.DedicatedServer.v(DedicatedServer.java:273)
	at net.minecraft.server.v1_7_R2.MinecraftServer.u(MinecraftServer.java:566)
	at net.minecraft.server.v1_7_R2.MinecraftServer.run(MinecraftServer.java:472)
	at net.minecraft.server.v1_7_R2.ThreadServerApplication.run(SourceFile:618)
Caused by: java.lang.NoSuchMethodError: org.bukkit.Bukkit.getOnlinePlayers()Ljava/util/Collection;
	at eu.lihp.bukkit.aurajoin.AuraJoinListener.damagedByEntity(AuraJoinListener.java:106)
	at sun.reflect.GeneratedMethodAccessor99.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:292)
	... 21 more