Error

2013-07-21 14:43:59 [SEVERE] Could not load 'plugins\CreepersPlus-4.2.1.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.NoSuchMethodException: com.github.KrazyTraynz.CreepersPlus.<init>()
	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:184)
	at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:306)
	at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:230)
	at org.bukkit.craftbukkit.v1_6_R2.CraftServer.loadPlugins(CraftServer.java:243)
	at net.minecraft.server.v1_6_R2.DedicatedServer.init(DedicatedServer.java:117)
	at net.minecraft.server.v1_6_R2.MinecraftServer.run(MinecraftServer.java:397)
	at net.minecraft.server.v1_6_R2.ThreadServerApplication.run(SourceFile:582)
Caused by: java.lang.NoSuchMethodException: com.github.KrazyTraynz.CreepersPlus.<init>()
	at java.lang.Class.getConstructor0(Unknown Source)
	at java.lang.Class.getConstructor(Unknown Source)
	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:176)
	... 6 more