PeX problem -.-

2012-09-01 15:45:13 [WARNING] Failed to handle packet: java.lang.RuntimeException: No groups defined. Check your permissions file.
java.lang.RuntimeException: No groups defined. Check your permissions file.
	at ru.tehkode.permissions.backends.FileBackend.getDefaultGroup(FileBackend.java:139)
	at ru.tehkode.permissions.PermissionManager.getDefaultGroup(PermissionManager.java:290)
	at ru.tehkode.permissions.PermissionManager.getDefaultGroup(PermissionManager.java:279)
	at ru.tehkode.permissions.PermissionUser.getGroups(PermissionUser.java:221)
	at ru.tehkode.permissions.PermissionUser.getOption(PermissionUser.java:132)
	at ru.tehkode.permissions.PermissionEntity.getOptionBoolean(PermissionEntity.java:294)
	at ru.tehkode.permissions.PermissionEntity.initialize(PermissionEntity.java:53)
	at ru.tehkode.permissions.PermissionUser.initialize(PermissionUser.java:53)
	at ru.tehkode.permissions.ProxyPermissionUser.initialize(ProxyPermissionUser.java:41)
	at ru.tehkode.permissions.PermissionManager.getUser(PermissionManager.java:117)
	at ru.tehkode.permissions.PermissionManager.getUser(PermissionManager.java:134)
	at ru.tehkode.permissions.bukkit.PermissionsEx.getUser(PermissionsEx.java:159)
	at ru.tehkode.permissions.bukkit.superperms.PermissiblePEX.isPermissionSet(PermissiblePEX.java:218)
	at org.bukkit.permissions.PermissibleBase.hasPermission(PermissibleBase.java:71)
	at ru.tehkode.permissions.bukkit.superperms.PermissiblePEX.checkPermission(PermissiblePEX.java:121)
	at ru.tehkode.permissions.bukkit.superperms.PermissiblePEX.hasPermission(PermissiblePEX.java:110)
	at org.bukkit.craftbukkit.entity.CraftHumanEntity.hasPermission(CraftHumanEntity.java:98)
	at org.bukkit.craftbukkit.CraftServer.onPlayerJoin(CraftServer.java:1175)
	at net.minecraft.server.ServerConfigurationManagerAbstract.c(ServerConfigurationManagerAbstract.java:168)
	at net.minecraft.server.ServerConfigurationManagerAbstract.a(ServerConfigurationManagerAbstract.java:92)
	at net.minecraft.server.NetLoginHandler.d(NetLoginHandler.java:121)
	at net.minecraft.server.NetLoginHandler.c(NetLoginHandler.java:41)
	at net.minecraft.server.DedicatedServerConnectionThread.a(DedicatedServerConnectionThread.java:44)
	at net.minecraft.server.DedicatedServerConnection.b(SourceFile:29)
	at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:581)
	at net.minecraft.server.DedicatedServer.q(DedicatedServer.java:212)
	at net.minecraft.server.MinecraftServer.p(MinecraftServer.java:474)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:406)
	at net.minecraft.server.ThreadServerApplication.run(SourceFile:539)