Bukkit

What steps will reproduce the problem?
1. /permissions group list

What is the expected output? What do you see instead?
The expected output is a list of groups. "An internal error occured."

What version of the product are you using?
2.0

Do you have an error log of what happened?
2013-07-07 19:47:12 [INFO] tzvij515 issued server command: /permissions reload
2013-07-07 19:47:12 [SEVERE] [PermissionsBukkit] Failed to load configuration
org.bukkit.configuration.InvalidConfigurationException: while scanning for the next token
found character     '\t' that cannot start any token
in "<string>", line 2, column 1:
        dylor:
    ^

    at org.bukkit.configuration.file.YamlConfiguration.loadFromString(YamlConfiguration.java:55)
    at org.bukkit.configuration.file.FileConfiguration.load(FileConfiguration.java:138)
    at org.bukkit.configuration.file.FileConfiguration.load(FileConfiguration.java:105)
    at com.platymuus.bukkit.permissions.PermissionsPlugin.reloadConfig(PermissionsPlugin.java:78)
    at com.platymuus.bukkit.permissions.PermissionsCommand.onCommand(PermissionsCommand.java:35)
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
    at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:189)
    at org.bukkit.craftbukkit.v1_6_R1.CraftServer.dispatchCommand(CraftServer.java:523)
    at net.minecraft.server.v1_6_R1.PlayerConnection.handleCommand(PlayerConnection.java:983)
    at net.minecraft.server.v1_6_R1.PlayerConnection.chat(PlayerConnection.java:901)
    at net.minecraft.server.v1_6_R1.PlayerConnection.a(PlayerConnection.java:858)
    at net.minecraft.server.v1_6_R1.Packet3Chat.handle(SourceFile:49)
    at net.minecraft.server.v1_6_R1.NetworkManager.b(NetworkManager.java:293)
    at net.minecraft.server.v1_6_R1.PlayerConnection.d(PlayerConnection.java:118)
    at net.minecraft.server.v1_6_R1.ServerConnection.b(SourceFile:37)
    at net.minecraft.server.v1_6_R1.DedicatedServerConnection.b(SourceFile:30)
    at net.minecraft.server.v1_6_R1.MinecraftServer.t(MinecraftServer.java:590)
    at net.minecraft.server.v1_6_R1.DedicatedServer.t(DedicatedServer.java:226)
    at net.minecraft.server.v1_6_R1.MinecraftServer.s(MinecraftServer.java:486)
    at net.minecraft.server.v1_6_R1.MinecraftServer.run(MinecraftServer.java:419)
    at net.minecraft.server.v1_6_R1.ThreadServerApplication.run(SourceFile:582)
Caused by: while scanning for the next token
found character     '\t' that cannot start any token
in "<string>", line 2, column 1:
        dylor:
    ^

    at org.yaml.snakeyaml.scanner.ScannerImpl.fetchMoreTokens(ScannerImpl.java:358)
    at org.yaml.snakeyaml.scanner.ScannerImpl.checkToken(ScannerImpl.java:179)
    at org.yaml.snakeyaml.parser.ParserImpl$ParseBlockMappingValue.produce(ParserImpl.java:591)
    at org.yaml.snakeyaml.parser.ParserImpl.peekEvent(ParserImpl.java:161)
    at org.yaml.snakeyaml.parser.ParserImpl.checkEvent(ParserImpl.java:146)
    at org.yaml.snakeyaml.composer.Composer.composeNode(Composer.java:133)
    at org.yaml.snakeyaml.composer.Composer.composeMappingNode(Composer.java:237)
    at org.yaml.snakeyaml.composer.Composer.composeNode(Composer.java:160)
    at org.yaml.snakeyaml.composer.Composer.composeDocument(Composer.java:123)
    at org.yaml.snakeyaml.composer.Composer.getSingleNode(Composer.java:106)
    at org.yaml.snakeyaml.constructor.BaseConstructor.getSingleData(BaseConstructor.java:121)
    at org.yaml.snakeyaml.Yaml.loadFromReader(Yaml.java:480)
    at org.yaml.snakeyaml.Yaml.load(Yaml.java:399)
    at org.bukkit.configuration.file.YamlConfiguration.loadFromString(YamlConfiguration.java:53)
    ... 20 more
2013-07-07 19:47:28 [INFO] tzvij515 issued server command: /permissions group list
2013-07-07 19:47:28 [SEVERE] null
org.bukkit.command.CommandException: Unhandled exception executing command 'permissions' in plugin PermissionsBukkit v2.0
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46)
    at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:189)
    at org.bukkit.craftbukkit.v1_6_R1.CraftServer.dispatchCommand(CraftServer.java:523)
    at net.minecraft.server.v1_6_R1.PlayerConnection.handleCommand(PlayerConnection.java:983)
    at net.minecraft.server.v1_6_R1.PlayerConnection.chat(PlayerConnection.java:901)
    at net.minecraft.server.v1_6_R1.PlayerConnection.a(PlayerConnection.java:858)
    at net.minecraft.server.v1_6_R1.Packet3Chat.handle(SourceFile:49)
    at net.minecraft.server.v1_6_R1.NetworkManager.b(NetworkManager.java:293)
    at net.minecraft.server.v1_6_R1.PlayerConnection.d(PlayerConnection.java:118)
    at net.minecraft.server.v1_6_R1.ServerConnection.b(SourceFile:37)
    at net.minecraft.server.v1_6_R1.DedicatedServerConnection.b(SourceFile:30)
    at net.minecraft.server.v1_6_R1.MinecraftServer.t(MinecraftServer.java:590)
    at net.minecraft.server.v1_6_R1.DedicatedServer.t(DedicatedServer.java:226)
    at net.minecraft.server.v1_6_R1.MinecraftServer.s(MinecraftServer.java:486)
    at net.minecraft.server.v1_6_R1.MinecraftServer.run(MinecraftServer.java:419)
    at net.minecraft.server.v1_6_R1.ThreadServerApplication.run(SourceFile:582)
Caused by: java.lang.NullPointerException
    at com.platymuus.bukkit.permissions.PermissionsCommand.groupCommand(PermissionsCommand.java:189)
    at com.platymuus.bukkit.permissions.PermissionsCommand.onCommand(PermissionsCommand.java:168)
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
    ... 15 more

Please provide any additional information below.
config.yml
users:
    N/A:
        groups:
            - HighCouncil

    N/A:
        groups:
        - CouncilPresident
groups:
    Newbie:
        permissions:
            permissions.build: false
            commandbook.time.player: false
            commandbook.spawn: true
            commandbook.teleport: false
            commandbook.warp.teleport: false
            commandbook.warp.set: false
            tardis.use: false
            commandbook.gamemode: false
            tardis.deluxe: false
            tardis.timetravel.location: false
            permissions.group.setperm: false
            tardis.admin: false
            permissions.group.unsetperm: false
            permissions.player.setperm: false
    TimeLord:
        permissions:
            permissions.build: true
            tardis.create: true
            commandbook.time.player: true
            commandbook.spawn: true
            commandbook.teleport: false
            commandbook.warp.teleport: true
            commandbook.warp.set: false
            commandbook.gamemode: true
            tardis.use: true
            tardis.deluxe: false
            tardis.timetravel.location: true
            permissions.group.setperm: false
            tardis.admin: false
            permissions.group.unsetperm: false
            permissions.player.setperm: false
    HighCouncil:
        permissions:
            permissions.build: true
            tardis.create: true
            commandbook.time.player: true
            commandbook.spawn: true
            commandbook.teleport: true
            commandbook.warp.teleport: true
            commandbook.warp.set: true
            commandbook.gamemode: true
            tardis.use: true
            tardis.deluxe: true
            tardis.timetravel.location: true
            tardis.admin: true
            permissions.group.setperm: true
            permissions.group.unsetperm: true
            permissions.player.setperm: true
    CouncilPresident:
        permissions:
            permissions.build: true
            tardis.create: true
            commandbook.time.player: true
            commandbook.spawn: true
            commandbook.teleport: true
            commandbook.warp.teleport: true
            commandbook.warp.set: true
            commandbook.gamemode: true
            tardis.use: true
            tardis.deluxe: true
            tardis.timetravel.location: true
            tardis.admin: true
            permissions.group.setperm: true
            permissions.group.unsetperm: true
            permissions.player.setperm: true
messages:
    build: '&cYou do not have permission to build.'