error

012-08-19 00:29:00 [SEVERE] Could not pass event PlayerChangedWorldEvent to PermissionsBukkitorg.bukkit.event.EventException
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:332)
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:462)
	at net.minecraft.server.ServerConfigurationManagerAbstract.moveToWorld(ServerConfigurationManagerAbstract.java:412)
	at net.minecraft.server.ServerConfigurationManagerAbstract.changeDimension(ServerConfigurationManagerAbstract.java:484)
	at net.minecraft.server.EntityPlayer.g(EntityPlayer.java:239)
	at net.minecraft.server.NetServerHandler.d(NetServerHandler.java:128)
	at net.minecraft.server.ServerConnection.b(SourceFile:35)
	at net.minecraft.server.DedicatedServerConnection.b(SourceFile:30)
	at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:583)
	at net.minecraft.server.DedicatedServer.q(DedicatedServer.java:212)
	at net.minecraft.server.MinecraftServer.p(MinecraftServer.java:476)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:408)
	at net.minecraft.server.ThreadServerApplication.run(SourceFile:539)
Caused by: java.lang.StackOverflowError
	at java.lang.AbstractStringBuilder.expandCapacity(Unknown Source)
	at java.lang.AbstractStringBuilder.ensureCapacityInternal(Unknown Source)
	at java.lang.AbstractStringBuilder.insert(Unknown Source)
	at java.lang.StringBuilder.insert(Unknown Source)
	at org.bukkit.configuration.MemorySection.createPath(MemorySection.java:767)
	at org.bukkit.configuration.MemorySection.mapChildrenKeys(MemorySection.java:691)
	at org.bukkit.configuration.MemorySection.mapChildrenKeys(MemorySection.java:695)
	at org.bukkit.configuration.MemorySection.mapChildrenKeys(MemorySection.java:695)
	at org.bukkit.configuration.MemorySection.getKeys(MemorySection.java:76)
	at com.platymuus.bukkit.permissions.PermissionsPlugin.getNode(PermissionsPlugin.java:180)
	at com.platymuus.bukkit.permissions.PermissionsPlugin.getAllPerms(PermissionsPlugin.java:190)
	at com.platymuus.bukkit.permissions.PermissionsPlugin.calculateGroupPermissions(PermissionsPlugin.java:301)
	at com.platymuus.bukkit.permissions.PermissionsPlugin.calculateGroupPermissions(PermissionsPlugin.java:314)
	at com.platymuus.bukkit.permissions.PermissionsPlugin.calculateGroupPermissions(PermissionsPlugin.java:314)
	at com.platymuus.bukkit.permissions.PermissionsPlugin.calculateGroupPermissions(PermissionsPlugin.java:314)
	at com.platymuus.bukkit.permissions.PermissionsPlugin.calculateGroupPermissions(PermissionsPlugin.java:314)
	at com.platymuus.bukkit.permissions.PermissionsPlugin.calculateGroupPermissions(PermissionsPlugin.java:314)
[WARNING] Can't keep up! Did the system time change, or is the server overloaded?