vampireerror

[SEVERE] Could not load 'plugins\vampire.jar' in folder 'plugins'
org.bukkit.plugin.UnknownDependencyException: mcore5
	at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:195)
	at org.bukkit.craftbukkit.v1_4_6.CraftServer.loadPlugins(CraftServer.java:235)
	at org.bukkit.craftbukkit.v1_4_6.CraftServer.<init>(CraftServer.java:213)
	at net.minecraft.server.v1_4_6.PlayerList.<init>(PlayerList.java:52)
	at net.minecraft.server.v1_4_6.DedicatedPlayerList.<init>(SourceFile:11)
	at net.minecraft.server.v1_4_6.DedicatedServer.init(DedicatedServer.java:104)
	at net.minecraft.server.v1_4_6.MinecraftServer.run(MinecraftServer.java:399)
	at net.minecraft.server.v1_4_6.ThreadServerApplication.run(SourceFile:849)
2013-01-01 16:20:10 [INFO]