quand je mets les plugin essential v2.1.12 dans le répertoire plugin et que je lance le serveur,

j'ai ce message d'erreur:

Error occurred while enabling Essentials v2.12.2 (Is it up to date?)
java.lang.NoSuchMethodError: org.bukkit.Server.getOnlinePlayers()[Lorg/bukkit/entity/Player;
at com.earth2me.essentials.Essentials.handleCrash(Essentials.java:691) ~[?:?]
at com.earth2me.essentials.Essentials.onEnable(Essentials.java:246) ~[?:?]
at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:264) ~[spigot.jar:git-Spigot-23b6354-0481ae9]
at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:337) [spigot.jar:git-Spigot-23b6354-0481ae9]
at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:402) [spigot.jar:git-Spigot-23b6354-0481ae9]
at org.bukkit.craftbukkit.v1_12_R1.CraftServer.enablePlugin(CraftServer.java:377) [spigot.jar:git-Spigot-23b6354-0481ae9]
at org.bukkit.craftbukkit.v1_12_R1.CraftServer.enablePlugins(CraftServer.java:327) [spigot.jar:git-Spigot-23b6354-0481ae9]
at net.minecraft.server.v1_12_R1.MinecraftServer.t(MinecraftServer.java:421) [spigot.jar:git-Spigot-23b6354-0481ae9]
at net.minecraft.server.v1_12_R1.MinecraftServer.l(MinecraftServer.java:382) [spigot.jar:git-Spigot-23b6354-0481ae9]
at net.minecraft.server.v1_12_R1.MinecraftServer.a(MinecraftServer.java:337) [spigot.jar:git-Spigot-23b6354-0481ae9]
at net.minecraft.server.v1_12_R1.DedicatedServer.init(DedicatedServer.java:272) [spigot.jar:git-Spigot-23b6354-0481ae9]
at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:544) [spigot.jar:git-Spigot-23b6354-0481ae9]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_151]

Je ne sais pas quoi faire pour lancer le serveur.

J'ai essayé plusieurs versions de minecraft et de essentials...

Merci d'avance