Stack Trace

10:30:48 [SEVERE] Error occurred while enabling kEssentials v1.0 (Is it up to date?)
java.lang.NullPointerException
	at <thisclass>.thisMethod(<thisclass>.java:18)
	at <mainclass>.onEnable(<mainclass>.java:24)
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:217)
	at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:457)
	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:381)
	at org.bukkit.craftbukkit.v1_4_6.CraftServer.loadPlugin(CraftServer.java:278)
	at org.bukkit.craftbukkit.v1_4_6.CraftServer.enablePlugins(CraftServer.java:260)
	at net.minecraft.server.v1_4_6.MinecraftServer.j(MinecraftServer.java:321)
	at net.minecraft.server.v1_4_6.MinecraftServer.e(MinecraftServer.java:300)
	at net.minecraft.server.v1_4_6.MinecraftServer.a(MinecraftServer.java:259)
	at net.minecraft.server.v1_4_6.DedicatedServer.init(DedicatedServer.java:149)
	at net.minecraft.server.v1_4_6.MinecraftServer.run(MinecraftServer.java:399)
	at net.minecraft.server.v1_4_6.ThreadServerApplication.run(SourceFile:849)