Probleme GroupManager

Bonjour,
j'ai configuré mes permissions avec GroupManager et quand je redémarre le serveur :

= ERROR REPORT START - 2.0 (2.9.6) (Phoenix) =

java.lang.IllegalArgumentException: The following file couldn't pass on Parser.
plugins/GroupManager/worlds/world/groups.yml
at org.anjocaido.groupmanager.dataholder.WorldDataHolder.loadGroups(WorldDataHolder.java:497)
at org.anjocaido.groupmanager.dataholder.WorldDataHolder.loadGroups(WorldDataHolder.java:417)
at org.anjocaido.groupmanager.dataholder.worlds.WorldsHolder.loadWorld(WorldsHolder.java:629)
at org.anjocaido.groupmanager.dataholder.worlds.WorldsHolder.loadWorld(WorldsHolder.java:591)
at org.anjocaido.groupmanager.dataholder.worlds.WorldsHolder.initialWorldLoading(WorldsHolder.java:88)
at org.anjocaido.groupmanager.dataholder.worlds.WorldsHolder.initialLoad(WorldsHolder.java:78)
at org.anjocaido.groupmanager.dataholder.worlds.WorldsHolder.resetWorldsHolder(WorldsHolder.java:70)
at org.anjocaido.groupmanager.dataholder.worlds.WorldsHolder.<init>(WorldsHolder.java:59)
at org.anjocaido.groupmanager.GroupManager.onEnable(GroupManager.java:163)
at org.anjocaido.groupmanager.GroupManager.onEnable(GroupManager.java:87)
at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:218)
at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:457)
at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:384)
at org.bukkit.craftbukkit.v1_7_R1.CraftServer.loadPlugin(CraftServer.java:298)
at org.bukkit.craftbukkit.v1_7_R1.CraftServer.enablePlugins(CraftServer.java:280)
at net.minecraft.server.v1_7_R1.MinecraftServer.m(MinecraftServer.java:342)
at net.minecraft.server.v1_7_R1.MinecraftServer.g(MinecraftServer.java:319)
at net.minecraft.server.v1_7_R1.MinecraftServer.a(MinecraftServer.java:275)
at net.minecraft.server.v1_7_R1.DedicatedServer.init(DedicatedServer.java:175)
at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java:424)
at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:617)
Caused by: while scanning for the next token
found character '\t' that cannot start any token
in "<reader>", line 24, column 24:
- creativegates.use
^

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$ParseIndentlessSequenceEntry.produce(ParserImpl.java:537)
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.composeSequenceNode(Composer.java:203)
at org.yaml.snakeyaml.composer.Composer.composeNode(Composer.java:158)
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.composeMappingNode(Composer.java:237)
at org.yaml.snakeyaml.composer.Composer.composeNode(Composer.java:160)
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:423)
at org.anjocaido.groupmanager.dataholder.WorldDataHolder.loadGroups(WorldDataHolder.java:492)
... 20 more

Mon fichier group :

groups:
Gamer:
default: true
permissions:
- essentials.signs.use.warp
- essentials.afk
- essentials.help
- essentials.list
- essentials.mail
- essentials.me
- essentials.msg
- essentials.suicide
- essentials.spawn
- creativegates.use
- serversigns.use
inheritance: []
info:
prefix: '&7'
build: false
suffix:
Admin:
default: false
permissions:
- '*'
inheritance: []
info:
prefix: '&c'
build: true
suffix:

Merci d'avance pour vos réponses.