Bukkit

I keep getting this error with latest version. It freezes up my server for 10 seconds and creates a HUGE lag spike. Would love some help with diagnosing the problem.

3:52:49 PM CONSOLE: [WARNING] [Server] The main thread failed to respond after 10 seconds 3:52:49 PM CONSOLE: [WARNING] [Server] Probable Plugin causes: 'bPermissions and Buycraft' 3:52:49 PM CONSOLE: [WARNING] [Server] What follows is the stack trace of the main thread 3:52:49 PM CONSOLE: [WARNING] [Server] at java.lang.String.toLowerCase(Unknown Source) 3:52:49 PM CONSOLE: [WARNING] [Server] at java.lang.String.toLowerCase(Unknown Source) 3:52:49 PM CONSOLE: [WARNING] [Server] at org.bukkit.plugin.SimplePluginManager.getPermission(SimplePluginManager.java:565) 3:52:49 PM CONSOLE: [WARNING] [Server] at org.bukkit.permissions.PermissibleBase.calculateChildPermissions(PermissibleBase.java:182) 3:52:49 PM CONSOLE: [WARNING] [Server] at org.bukkit.permissions.PermissibleBase.calculateChildPermissions(PermissibleBase.java:190) 3:52:49 PM CONSOLE: [WARNING] [Server] at org.bukkit.permissions.PermissibleBase.calculateChildPermissions(PermissibleBase.java:190) 3:52:49 PM CONSOLE: [WARNING] [Server] at org.bukkit.permissions.PermissibleBase.calculateChildPermissions(PermissibleBase.java:190) 3:52:49 PM CONSOLE: [WARNING] [Server] at org.bukkit.permissions.PermissibleBase.calculateChildPermissions(PermissibleBase.java:190) 3:52:49 PM CONSOLE: [WARNING] [Server] at org.bukkit.permissions.PermissibleBase.recalculatePermissions(PermissibleBase.java:161) 3:52:49 PM CONSOLE: [WARNING] [Server] at org.bukkit.craftbukkit.v1_6_R2.entity.CraftHumanEntity.recalculatePermissions(CraftHumanEntity.java:139) 3:52:49 PM CONSOLE: [WARNING] [Server] at org.bukkit.permissions.PermissionAttachment.unsetPermission(PermissionAttachment.java:104) 3:52:49 PM CONSOLE: [WARNING] [Server] at de.bananaco.bpermissions.imp.BukkitCompat.doBukkitPermissions(BukkitCompat.java:55) 3:52:49 PM CONSOLE: [WARNING] [Server] at de.bananaco.bpermissions.imp.BukkitCompat.setPermissions(BukkitCompat.java:34) 3:52:49 PM CONSOLE: [WARNING] [Server] at de.bananaco.bpermissions.imp.SuperPermissionHandler.setPermissions(SuperPermissionHandler.java:50) 3:52:49 PM CONSOLE: [WARNING] [Server] at de.bananaco.bpermissions.imp.SuperPermissionHandler.setupPlayer(SuperPermissionHandler.java:90) 3:52:49 PM CONSOLE: [WARNING] [Server] at de.bananaco.bpermissions.imp.SuperPermissionHandler.setupPlayer(SuperPermissionHandler.java:172) 3:52:49 PM CONSOLE: [WARNING] [Server] at de.bananaco.bpermissions.imp.YamlWorld.setupPlayer(YamlWorld.java:321) 3:52:49 PM CONSOLE: [WARNING] [Server] at de.bananaco.bpermissions.imp.YamlWorld.setupAll(YamlWorld.java:308) 3:52:49 PM CONSOLE: [WARNING] [Server] at de.bananaco.bpermissions.api.CalculableWrapper.addGroup(CalculableWrapper.java:36) 3:52:49 PM CONSOLE: [WARNING] [Server] at de.bananaco.bpermissions.imp.ExtraCommands.execute(ExtraCommands.java:27) 3:52:49 PM CONSOLE: [WARNING] [Server] at de.bananaco.bpermissions.imp.Permissions.onCommand(Permissions.java:395) 3:52:49 PM CONSOLE: [WARNING] [Server] at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) 3:52:49 PM CONSOLE: [WARNING] [Server] at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:189) 3:52:49 PM CONSOLE: [WARNING] [Server] at org.bukkit.craftbukkit.v1_6_R2.CraftServer.dispatchCommand(CraftServer.java:523) 3:52:49 PM CONSOLE: [WARNING] [Server] at org.bukkit.Bukkit.dispatchCommand(Bukkit.java:303) 3:52:49 PM CONSOLE: [WARNING] [Server] at net.buycraft.tasks.CommandExecuteTask.run(CommandExecuteTask.java:82) 3:52:49 PM CONSOLE: [WARNING] [Server] at org.bukkit.craftbukkit.v1_6_R2.scheduler.CraftTask.run(CraftTask.java:53) 3:52:49 PM CONSOLE: [WARNING] [Server] at org.bukkit.craftbukkit.v1_6_R2.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:345) 3:52:49 PM CONSOLE: [WARNING] [Server] at net.minecraft.server.v1_6_R2.MinecraftServer.t(MinecraftServer.java:522) 3:52:49 PM CONSOLE: [WARNING] [Server] at net.minecraft.server.v1_6_R2.DedicatedServer.t(DedicatedServer.java:226) 3:52:49 PM CONSOLE: [WARNING] [Server] at net.minecraft.server.v1_6_R2.MinecraftServer.s(MinecraftServer.java:486) 3:52:49 PM CONSOLE: [WARNING] [Server] at net.minecraft.server.v1_6_R2.MinecraftServer.run(MinecraftServer.java:419) 3:52:49 PM CONSOLE: [WARNING] [Server] at net.minecraft.server.v1_6_R2.ThreadServerApplication.run(SourceFile:582)