Error

2012-03-05 19:59:06 [SEVERE] Could not load 'plugins\GlassDrops.jar' in folder 'plugins':
java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
	at java.lang.reflect.Constructor.newInstance(Unknown Source)
	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:136)
	at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:286)
	at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:201)
	at org.bukkit.craftbukkit.CraftServer.loadPlugins(CraftServer.java:164)
	at org.bukkit.craftbukkit.CraftServer.<init>(CraftServer.java:140)
	at net.minecraft.server.ServerConfigurationManager.<init>(ServerConfigurationManager.java:52)
	at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:148)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:408)
	at net.minecraft.server.ThreadServerApplication.run(SourceFile:465)
Caused by: java.lang.NullPointerException
	at me.ben.GlassDrops.GlassDropListener.<init>(GlassDropListener.java:26)
	at me.ben.GlassDrops.GlassDrops.<init>(GlassDrops.java:18)
	... 13 more