Error occurred while enabling NPCWarehouse v1.1.2 (Is it up to date?)
java.lang.NoSuchMethodError: org.bukkit.scheduler.BukkitScheduler.runTaskTimer(Lorg/bukkit/plugin/Plugin;Ljava/lang/Runnable;JJ)Lorg/bukkit/scheduler/BukkitTask;
	at net.npcwarehouse.NPCWarehouse.onEnable(NPCWarehouse.java:135)
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:215)
	at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:337)
	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:386)
	at org.bukkit.craftbukkit.CraftServer.loadPlugin(CraftServer.java:264)
	at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:246)
	at net.minecraft.server.MinecraftServer.t(MinecraftServer.java:387)
	at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:374)
	at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:208)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:438)
	at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)