Group Manager not working?

I need help! For the past 6 hours I've been browsing and browsing and using trial-and-error to try and fix this plugin. It worked fine, until I started editing it... T-T
Please don't give me any of that "USE PEX!" crap because my friends also use this plugin and until now mine worked. This is my error log:
ERROR REPORT START - 2.0 (2.11.1) (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:496)
at org.anjocaido.groupmanager.dataholder.WorldDataHolder.loadGroups(WorldDataHolder.java:416)
at org.anjocaido.groupmanager.dataholder.worlds.WorldsHolder.loadWorld(WorldsHolder.java:678)
at org.anjocaido.groupmanager.dataholder.worlds.WorldsHolder.loadWorld(WorldsHolder.java:640)
at org.anjocaido.groupmanager.dataholder.worlds.WorldsHolder.initialWorldLoading(WorldsHolder.java:110)
at org.anjocaido.groupmanager.dataholder.worlds.WorldsHolder.initialLoad(WorldsHolder.java:100)
at org.anjocaido.groupmanager.dataholder.worlds.WorldsHolder.resetWorldsHolder(WorldsHolder.java:92)
at org.anjocaido.groupmanager.dataholder.worlds.WorldsHolder.<init>(WorldsHolder.java:59)
at org.anjocaido.groupmanager.GroupManager.onEnable(GroupManager.java:169)
at org.anjocaido.groupmanager.GroupManager.onEnable(GroupManager.java:93)
at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:217)
at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:457)
at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:381)
at org.bukkit.craftbukkit.v1_6_R2.CraftServer.loadPlugin(CraftServer.java:282)
at org.bukkit.craftbukkit.v1_6_R2.CraftServer.enablePlugins(CraftServer.java:264)
at net.minecraft.server.v1_6_R2.MinecraftServer.l(MinecraftServer.java:313)
at net.minecraft.server.v1_6_R2.MinecraftServer.f(MinecraftServer.java:290)
at net.minecraft.server.v1_6_R2.MinecraftServer.a(MinecraftServer.java:250)
at net.minecraft.server.v1_6_R2.DedicatedServer.init(DedicatedServer.java:151)
at net.minecraft.server.v1_6_R2.MinecraftServer.run(MinecraftServer.java:391)
at net.minecraft.server.v1_6_R2.ThreadServerApplication.run(SourceFile:582)
Caused by: while scanning for the next token
found character '\t' that cannot start any token
in "<reader>", line 25, column 1:
- bukkit.command.kill
^

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.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:491)
... 20 more

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That's it! I have no idea what to do at this point... PLEASE HELP!!!