java.lang.RuntimeException: java.lang.NullPointerException
	at ru.tehkode.permissions.commands.CommandsManager.execute(CommandsManager.java:121)
	at ru.tehkode.permissions.bukkit.PermissionsEx.onCommand(PermissionsEx.java:159)
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:189)
	at org.bukkit.craftbukkit.v1_5_R3.CraftServer.dispatchCommand(CraftServer.java:523)
	at org.bukkit.craftbukkit.v1_5_R3.CraftServer.dispatchServerCommand(CraftServer.java:512)
	at net.minecraft.server.v1_5_R3.DedicatedServer.an(DedicatedServer.java:262)
	at net.minecraft.server.v1_5_R3.DedicatedServer.r(DedicatedServer.java:227)
	at net.minecraft.server.v1_5_R3.MinecraftServer.q(MinecraftServer.java:477)
	at net.minecraft.server.v1_5_R3.MinecraftServer.run(MinecraftServer.java:410)
	at net.minecraft.server.v1_5_R3.ThreadServerApplication.run(SourceFile:573)
Caused by: java.lang.NullPointerException
	at ru.tehkode.permissions.backends.FileBackend.getRegisteredUsers(FileBackend.java:196)
	at ru.tehkode.permissions.PermissionBackend.getUsers(PermissionBackend.java:203)
	at ru.tehkode.permissions.PermissionManager.getUsers(PermissionManager.java:144)
	at ru.tehkode.permissions.bukkit.commands.PermissionsCommand.autoCompletePlayerName(PermissionsCommand.java:106)
	at ru.tehkode.permissions.bukkit.commands.PermissionsCommand.autoCompletePlayerName(PermissionsCommand.java:73)
	at ru.tehkode.permissions.bukkit.commands.UserCommands.userSetGroup(UserCommands.java:520)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at ru.tehkode.permissions.commands.CommandsManager$CommandBinding.call(CommandsManager.java:252)
	at ru.tehkode.permissions.commands.CommandsManager.execute(CommandsManager.java:114)
	... 10 more