Error

2013-08-31 08:33:46 [SEVERE] Could not load 'plugins/HotPotato.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: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.NullPointerException
	at me.avery246813579.HotPotato.Arena.Object.ArenaScoreboard.<init>(ArenaScoreboard.java:27)
	at me.avery246813579.HotPotato.HotPotato.<init>(HotPotato.java:65)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:178)
	... 6 more