ERROR

21:38:00 [SEVERE] Cannot load plugins\CaptureTheFlag\config.yml
org.bukkit.configuration.InvalidConfigurationException: could not determine a co
nstructor for the tag tag:yaml.org,2002:org.bukkit.craftbukkit.v1_4_6.CraftWorld

 in "<string>", line 4, column 8:
    World: !!org.bukkit.craftbukkit.v1_4_6. ...
           ^

        at org.bukkit.configuration.file.YamlConfiguration.loadFromString(YamlCo
nfiguration.java:55)
        at org.bukkit.configuration.file.FileConfiguration.load(FileConfiguratio
n.java:138)
        at org.bukkit.configuration.file.FileConfiguration.load(FileConfiguratio
n.java:105)
        at org.bukkit.configuration.file.YamlConfiguration.loadConfiguration(Yam
lConfiguration.java:175)
        at org.bukkit.plugin.java.JavaPlugin.reloadConfig(JavaPlugin.java:117)
        at org.bukkit.plugin.java.JavaPlugin.getConfig(JavaPlugin.java:111)
        at com.hotmail.MineCrypt.CTF.CTFMain.onEnable(CTFMain.java:25)
        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(SimplePluginManage
r.java:381)
        at org.bukkit.craftbukkit.v1_4_6.CraftServer.loadPlugin(CraftServer.java
:278)
        at org.bukkit.craftbukkit.v1_4_6.CraftServer.enablePlugins(CraftServer.j
ava:260)
        at org.bukkit.craftbukkit.v1_4_6.CraftServer.reload(CraftServer.java:587
)
        at org.bukkit.Bukkit.reload(Bukkit.java:184)
        at org.bukkit.command.defaults.ReloadCommand.execute(ReloadCommand.java:
23)
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:18
6)
        at org.bukkit.craftbukkit.v1_4_6.CraftServer.dispatchCommand(CraftServer
.java:510)
        at org.bukkit.craftbukkit.v1_4_6.CraftServer.dispatchServerCommand(Craft
Server.java:502)
        at net.minecraft.server.v1_4_6.DedicatedServer.al(DedicatedServer.java:2
60)
        at net.minecraft.server.v1_4_6.DedicatedServer.r(DedicatedServer.java:22
5)
        at net.minecraft.server.v1_4_6.MinecraftServer.q(MinecraftServer.java:49
4)
        at net.minecraft.server.v1_4_6.MinecraftServer.run(MinecraftServer.java:
427)
        at net.minecraft.server.v1_4_6.ThreadServerApplication.run(SourceFile:84
9)
Caused by: could not determine a constructor for the tag tag:yaml.org,2002:org.b
ukkit.craftbukkit.v1_4_6.CraftWorld
 in "<string>", line 4, column 8:
    World: !!org.bukkit.craftbukkit.v1_4_6. ...
           ^

        at org.yaml.snakeyaml.constructor.SafeConstructor$ConstructUndefined.con
struct(SafeConstructor.java:475)
        at org.yaml.snakeyaml.constructor.BaseConstructor.constructObject(BaseCo
nstructor.java:183)
        at org.yaml.snakeyaml.constructor.BaseConstructor.constructMapping2ndSte
p(BaseConstructor.java:326)
        at org.yaml.snakeyaml.constructor.SafeConstructor.constructMapping2ndSte
p(SafeConstructor.java:143)
        at org.yaml.snakeyaml.constructor.BaseConstructor.constructMapping(BaseC
onstructor.java:307)
        at org.yaml.snakeyaml.constructor.SafeConstructor$ConstructYamlMap.const
ruct(SafeConstructor.java:459)
        at org.bukkit.configuration.file.YamlConstructor$ConstructCustomObject.c
onstruct(YamlConstructor.java:26)
        at org.yaml.snakeyaml.constructor.BaseConstructor.constructObject(BaseCo
nstructor.java:183)
        at org.yaml.snakeyaml.constructor.BaseConstructor.constructDocument(Base
Constructor.java:142)
        at org.yaml.snakeyaml.constructor.BaseConstructor.getSingleData(BaseCons
tructor.java:128)
        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(YamlCo
nfiguration.java:53)
        ... 22 more