Error

java.lang.NullPointerException
	at me.timiboyultimate.stonecraft.Stonecraft.onEnable(Stonecraft.java:38)
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:217)
	at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:374)
	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:381)
	at org.bukkit.craftbukkit.CraftServer.loadPlugin(CraftServer.java:270)
	at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:252)
	at net.minecraft.server.MinecraftServer.j(MinecraftServer.java:320)
	at net.minecraft.server.MinecraftServer.e(MinecraftServer.java:299)
	at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:258)
	at net.minecraft.server.DedicatedServer.init(DedicatedServer.java:147)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:398)
	at net.minecraft.server.ThreadServerApplication.run(SourceFile:856)