dowolny enchant - kits

[15:41:05 ERROR]: Unhandled exception executing command 'kit' in plugin Kits v2.1
org.bukkit.command.CommandException: Unhandled exception executing command 'kit' in plugin Kits v2.1
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[craftbukkit.jar:git-Bukkit-1.6.4-R2.0-21-gcf51e92-b2938jnks]
        at com.earth2me.essentials.Essentials.onCommandEssentials(Essentials.java:395) [Essentials.jar:?]
        at com.earth2me.essentials.Essentials.onCommand(Essentials.java:380) [Essentials.jar:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) [craftbukkit.jar:git-Bukkit-1.6.4-R2.0-21-gcf51e92-b2938jnks]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:192) [craftbukkit.jar:git-Bukkit-1.6.4-R2.0-21-gcf51e92-b2938jnks]
        at org.bukkit.craftbukkit.v1_7_R1.CraftServer.dispatchCommand(CraftServer.java:542) [craftbukkit.jar:git-Bukkit-1.6.4-R2.0-21-gcf51e92-b2938jnks]
        at net.minecraft.server.v1_7_R1.PlayerConnection.handleCommand(PlayerConnection.java:925) [craftbukkit.jar:git-Bukkit-1.6.4-R2.0-21-gcf51e92-b2938jnks]
        at net.minecraft.server.v1_7_R1.PlayerConnection.a(PlayerConnection.java:805) [craftbukkit.jar:git-Bukkit-1.6.4-R2.0-21-gcf51e92-b2938jnks]
        at net.minecraft.server.v1_7_R1.PacketPlayInChat.a(PacketPlayInChat.java:28) [craftbukkit.jar:git-Bukkit-1.6.4-R2.0-21-gcf51e92-b2938jnks]
        at net.minecraft.server.v1_7_R1.PacketPlayInChat.handle(PacketPlayInChat.java:47) [craftbukkit.jar:git-Bukkit-1.6.4-R2.0-21-gcf51e92-b2938jnks]
        at net.minecraft.server.v1_7_R1.NetworkManager.a(NetworkManager.java:146) [craftbukkit.jar:git-Bukkit-1.6.4-R2.0-21-gcf51e92-b2938jnks]
        at net.minecraft.server.v1_7_R1.ServerConnection.c(SourceFile:134) [craftbukkit.jar:git-Bukkit-1.6.4-R2.0-21-gcf51e92-b2938jnks]
        at net.minecraft.server.v1_7_R1.MinecraftServer.u(MinecraftServer.java:651) [craftbukkit.jar:git-Bukkit-1.6.4-R2.0-21-gcf51e92-b2938jnks]
        at net.minecraft.server.v1_7_R1.DedicatedServer.u(DedicatedServer.java:250) [craftbukkit.jar:git-Bukkit-1.6.4-R2.0-21-gcf51e92-b2938jnks]
        at net.minecraft.server.v1_7_R1.MinecraftServer.t(MinecraftServer.java:541) [craftbukkit.jar:git-Bukkit-1.6.4-R2.0-21-gcf51e92-b2938jnks]
        at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java:453) [craftbukkit.jar:git-Bukkit-1.6.4-R2.0-21-gcf51e92-b2938jnks]
        at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:617) [craftbukkit.jar:git-Bukkit-1.6.4-R2.0-21-gcf51e92-b2938jnks]
Caused by: java.lang.NoSuchMethodError: org.bukkit.Bukkit.getOnlinePlayers()Ljava/util/Collection;
        at com.dragonphase.kits.commands.KitCommandExecutor.getPlayer(KitCommandExecutor.java:358) ~[?:?]
        at com.dragonphase.kits.commands.KitCommandExecutor.spawnKit(KitCommandExecutor.java:273) ~[?:?]
        at com.dragonphase.kits.commands.KitCommandExecutor.spawnKit(KitCommandExecutor.java:269) ~[?:?]
        at com.dragonphase.kits.commands.KitCommandExecutor.spawnKit(KitCommandExecutor.java:237) ~[?:?]
        at com.dragonphase.kits.commands.KitCommandExecutor.onCommand(KitCommandExecutor.java:49) ~[?:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[craftbukkit.jar:git-Bukkit-1.6.4-R2.0-21-gcf51e92-b2938jnks]
        ... 16 more