Stacktrace

18:13:36 [SEVERE] Could not load 'plugins/kEssentials.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.NullPointerException
    at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:182)
    at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:305)
    at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:230)
    at org.bukkit.craftbukkit.v1_4_6.CraftServer.loadPlugins(CraftServer.java:235)
    at org.bukkit.craftbukkit.v1_4_6.CraftServer.reload(CraftServer.java:585)
    at org.bukkit.Bukkit.reload(Bukkit.java:184)
    at org.bukkit.command.defaults.ReloadCommand.execute(ReloadCommand.java:23)
    at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:186)
    at org.bukkit.craftbukkit.v1_4_6.CraftServer.dispatchCommand(CraftServer.java:510)
    at org.bukkit.craftbukkit.v1_4_6.CraftServer.dispatchServerCommand(CraftServer.java:502)
    at net.minecraft.server.v1_4_6.DedicatedServer.al(DedicatedServer.java:260)
    at net.minecraft.server.v1_4_6.DedicatedServer.r(DedicatedServer.java:225)
    at net.minecraft.server.v1_4_6.MinecraftServer.q(MinecraftServer.java:494)
    at net.minecraft.server.v1_4_6.MinecraftServer.run(MinecraftServer.java:427)
    at net.minecraft.server.v1_4_6.ThreadServerApplication.run(SourceFile:849)
Caused by: java.lang.NullPointerException
    at org.bukkit.plugin.java.JavaPlugin.getResource(JavaPlugin.java:184)
    at me.KeybordPiano459.kEssentials.<theclass>.reloadFile(<theclass>.java:111)
    at me.KeybordPiano459.kEssentials.<theclass>.getFile(<theclass>.java:150)
    at me.KeybordPiano459.kEssentials.kEssentials.<init>(kEssentials.java:25)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
    at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:178)
    ... 14 more