Hello !

I'm on Spigot 1.11 and I use the latest dev build off Essentials, but there is a major bug.
When I write /kill it says this error :
[18:54:03 ERROR]: ╔chec de la commande kill :
java.lang.NoSuchMethodError: org.bukkit.event.entity.EntityDamageEvent.<init>(Lorg/bukkit/entity/Entity;Lorg/bukkit/event/entity/EntityDamageEvent$DamageCause;I)V
at com.earth2me.essentials.commands.Commandkill.updatePlayer(Commandkill.java:37) ~[Essentials-2.x-SNAPSHOT.jar:?]
at com.earth2me.essentials.commands.EssentialsLoopCommand.loopOnlinePlayers(EssentialsLoopCommand.java:132) ~[Essentials-2.x-SNAPSHOT.jar:?]
at com.earth2me.essentials.commands.Commandkill.run(Commandkill.java:26) ~[Essentials-2.x-SNAPSHOT.jar:?]
at com.earth2me.essentials.commands.EssentialsCommand.run(EssentialsCommand.java:186) ~[Essentials-2.x-SNAPSHOT.jar:?]
at com.earth2me.essentials.commands.EssentialsCommand.run(EssentialsCommand.java:180) ~[Essentials-2.x-SNAPSHOT.jar:?]
at com.earth2me.essentials.Essentials.onCommandEssentials(Essentials.java:526) [Essentials-2.x-SNAPSHOT.jar:?]
at com.earth2me.essentials.Essentials.onCommand(Essentials.java:401) [Essentials-2.x-SNAPSHOT.jar:?]
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) [spigot-1.8.8.jar:git-Spigot-261f181-7359112]
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) [spigot-1.8.8.jar:git-Spigot-261f181-7359112]
at org.bukkit.craftbukkit.v1_11_R1.CraftServer.dispatchCommand(CraftServer.java:649) [spigot-1.8.8.jar:git-Spigot-261f181-7359112]
at net.minecraft.server.v1_11_R1.PlayerConnection.handleCommand(PlayerConnection.java:1335) [spigot-1.8.8.jar:git-Spigot-261f181-7359112]
at net.minecraft.server.v1_11_R1.PlayerConnection.a(PlayerConnection.java:1170) [spigot-1.8.8.jar:git-Spigot-261f181-7359112]
at net.minecraft.server.v1_11_R1.PacketPlayInChat.a(PacketPlayInChat.java:45) [spigot-1.8.8.jar:git-Spigot-261f181-7359112]
at net.minecraft.server.v1_11_R1.PacketPlayInChat.a(PacketPlayInChat.java:1) [spigot-1.8.8.jar:git-Spigot-261f181-7359112]
at net.minecraft.server.v1_11_R1.PlayerConnectionUtils$1.run(SourceFile:13) [spigot-1.8.8.jar:git-Spigot-261f181-7359112]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_111]
at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_111]
at net.minecraft.server.v1_11_R1.SystemUtils.a(SourceFile:46) [spigot-1.8.8.jar:git-Spigot-261f181-7359112]
at net.minecraft.server.v1_11_R1.MinecraftServer.D(MinecraftServer.java:739) [spigot-1.8.8.jar:git-Spigot-261f181-7359112]
at net.minecraft.server.v1_11_R1.DedicatedServer.D(DedicatedServer.java:399) [spigot-1.8.8.jar:git-Spigot-261f181-7359112]
at net.minecraft.server.v1_11_R1.MinecraftServer.C(MinecraftServer.java:675) [spigot-1.8.8.jar:git-Spigot-261f181-7359112]
at net.minecraft.server.v1_11_R1.MinecraftServer.run(MinecraftServer.java:574) [spigot-1.8.8.jar:git-Spigot-261f181-7359112]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_111]