Broken GroupManager. Please read :)

Hello, I kinda somehow broke my whole Group Manager config. Not sure what I did wrong, But here's the error.log, I have no idea what any of it means so I was hoping you guys would

=============================== GM ERROR LOG ===============================
= ERROR REPORT START - 2.0 (Phoenix) =

java.lang.IllegalArgumentException: There was no Default Group declared in file: plugins/GroupManager/worlds/world/groups.yml
at org.anjocaido.groupmanager.dataholder.WorldDataHolder.loadGroups(WorldDataHolder.java:765)
at org.anjocaido.groupmanager.dataholder.WorldDataHolder.loadGroups(WorldDataHolder.java:477)
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:167)
at org.anjocaido.groupmanager.GroupManager.onEnable(GroupManager.java:91)
at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:316)
at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:324)
at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:404)
at org.bukkit.craftbukkit.v1_7_R3.CraftServer.loadPlugin(CraftServer.java:446)
at org.bukkit.craftbukkit.v1_7_R3.CraftServer.enablePlugins(CraftServer.java:380)
at org.bukkit.craftbukkit.v1_7_R3.CraftServer.reload(CraftServer.java:799)
at org.bukkit.Bukkit.reload(Bukkit.java:288)
at org.bukkit.command.defaults.ReloadCommand.execute(ReloadCommand.java:23)
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:180)
at org.bukkit.craftbukkit.v1_7_R3.CraftServer.dispatchCommand(CraftServer.java:701)
at net.minecraft.server.v1_7_R3.PlayerConnection.handleCommand(PlayerConnection.java:956)
at net.minecraft.server.v1_7_R3.PlayerConnection.a(PlayerConnection.java:817)
at net.minecraft.server.v1_7_R3.PacketPlayInChat.a(PacketPlayInChat.java:28)
at net.minecraft.server.v1_7_R3.PacketPlayInChat.handle(PacketPlayInChat.java:47)
at net.minecraft.server.v1_7_R3.NetworkManager.a(NetworkManager.java:157)
at net.minecraft.server.v1_7_R3.ServerConnection.c(SourceFile:134)
at net.minecraft.server.v1_7_R3.MinecraftServer.v(MinecraftServer.java:667)
at net.minecraft.server.v1_7_R3.DedicatedServer.v(DedicatedServer.java:260)
at net.minecraft.server.v1_7_R3.MinecraftServer.u(MinecraftServer.java:558)
at net.minecraft.server.v1_7_R3.MinecraftServer.run(MinecraftServer.java:469)
at net.minecraft.server.v1_7_R3.ThreadServerApplication.run(SourceFile:628)