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java.lang.ExceptionInInitializerError
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java.lang.ExceptionInInitializerError
java.lang.IllegalArgumentException: File cannot be null	at org.apache.commons.lang.Validate.notNull(Validate.java:203)	at org.bukkit.configuration.file.YamlConfiguration.loadConfiguration(YamlConfiguration.java:170)	at org.bukkit.plugin.java.JavaPlugin.reloadConfig(JavaPlugin.java:117)	at org.bukkit.plugin.java.JavaPlugin.getConfig(JavaPlugin.java:111)	at com.test.event.NC_Worlds_Delete.(NC_Worlds_Delete.java:9)	at com.test.event.NC_Worlds.(NC_Worlds.java:16)	at com.test.event.NC_Main.(NC_Main.java:25)	at java.lang.Class.forName0(Native Method)	at java.lang.Class.forName(Unknown Source)	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:143)	at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:305)	at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:230)	at org.bukkit.craftbukkit.CraftServer.loadPlugins(CraftServer.java:227)	at org.bukkit.craftbukkit.CraftServer.reload(CraftServer.java:577)	at org.bukkit.Bukkit.reload(Bukkit.java:183)	at org.bukkit.command.defaults.ReloadCommand.execute(ReloadCommand.java:23)	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:185)	at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:502)	at org.bukkit.craftbukkit.CraftServer.dispatchServerCommand(CraftServer.java:494)	at net.minecraft.server.DedicatedServer.al(DedicatedServer.java:258)	at net.minecraft.server.DedicatedServer.r(DedicatedServer.java:223)	at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:493)	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:426)	at net.minecraft.server.ThreadServerApplication.run(SourceFile:856)