NoSuchMethodError: org.buckit.Server.getOnlinePlayers()LJava/Util/Collection;

[Azim]

Gives an error @ version 1.7.9 Please help.

[Azim]

[15:54:30] [Server thread/ERROR]: Error occurred while enabling SplatoonUltimate v1.8.0 (Is it up to date?)
java.lang.NoSuchMethodError: org.bukkit.Server.getOnlinePlayers()Ljava/util/Collection;
    at com.shortcircuit.splatoon.util.AnnouncementHandler.announce(AnnouncementHandler.java:71) ~[?:?]
    at com.shortcircuit.splatoon.Splatoon.onEnable(Splatoon.java:78) ~[?:?]
    at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:316) ~[start.jar:git-Spigot-1486]
    at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:324) [start.jar:git-Spigot-1486]
    at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:405) [start.jar:git-Spigot-1486]
    at org.bukkit.craftbukkit.v1_7_R3.CraftServer.loadPlugin(CraftServer.java:465) [start.jar:git-Spigot-1486]
    at org.bukkit.craftbukkit.v1_7_R3.CraftServer.enablePlugins(CraftServer.java:383) [start.jar:git-Spigot-1486]
    at net.minecraft.server.v1_7_R3.MinecraftServer.n(MinecraftServer.java:359) [start.jar:git-Spigot-1486]
    at net.minecraft.server.v1_7_R3.MinecraftServer.g(MinecraftServer.java:333) [start.jar:git-Spigot-1486]
    at net.minecraft.server.v1_7_R3.MinecraftServer.a(MinecraftServer.java:289) [start.jar:git-Spigot-1486]
    at net.minecraft.server.v1_7_R3.DedicatedServer.init(DedicatedServer.java:193) [start.jar:git-Spigot-1486]
    at net.minecraft.server.v1_7_R3.MinecraftServer.run(MinecraftServer.java:457) [start.jar:git-Spigot-1486]
    at net.minecraft.server.v1_7_R3.ThreadServerApplication.run(SourceFile:628) [start.jar:git-Spigot-1486]