Ultimate Arena error

23:14:05 [INFO] [UltimateArena] Loaded 8 Arena Classes!
2013-09-28 23:14:05 [INFO] [UltimateArena] Loaded 10 arena config files!
2013-09-28 23:14:05 [INFO] [UltimateArena] Loaded 5 whitelisted commands!
2013-09-28 23:14:05 [INFO] [UltimateArena] Loaded 4 arena files!
2013-09-28 23:14:05 [SEVERE] Cannot load plugins\UltimateArena\signs.yml
org.bukkit.configuration.InvalidConfigurationException: could not determine a constructor for the tag tag:yaml.org,2002:net.dmulloy2.ultimatearena.types.ArenaZone
 in "<string>", line 3, column 11:
        name: !!net.dmulloy2.ultimatearena.typ ...
              ^

	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 org.bukkit.configuration.file.YamlConfiguration.loadConfiguration(YamlConfiguration.java:175)
	at net.dmulloy2.ultimatearena.handlers.SignHandler.load(SignHandler.java:53)
	at net.dmulloy2.ultimatearena.handlers.SignHandler.<init>(SignHandler.java:32)
	at net.dmulloy2.ultimatearena.UltimateArena.loadSigns(UltimateArena.java:434)
	at net.dmulloy2.ultimatearena.UltimateArena.loadFiles(UltimateArena.java:277)
	at net.dmulloy2.ultimatearena.UltimateArena$1.run(UltimateArena.java:268)
	at org.bukkit.craftbukkit.v1_6_R2.scheduler.CraftTask.run(CraftTask.java:53)
	at org.bukkit.craftbukkit.v1_6_R2.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:345)
	at net.minecraft.server.v1_6_R2.MinecraftServer.t(MinecraftServer.java:522)
	at net.minecraft.server.v1_6_R2.DedicatedServer.t(DedicatedServer.java:226)
	at net.minecraft.server.v1_6_R2.MinecraftServer.s(MinecraftServer.java:486)
	at net.minecraft.server.v1_6_R2.MinecraftServer.run(MinecraftServer.java:419)
	at net.minecraft.server.v1_6_R2.ThreadServerApplication.run(SourceFile:582)
Caused by: could not determine a constructor for the tag tag:yaml.org,2002:net.dmulloy2.ultimatearena.types.ArenaZone
 in "<string>", line 3, column 11:
        name: !!net.dmulloy2.ultimatearena.typ ...
              ^

	at org.yaml.snakeyaml.constructor.SafeConstructor$ConstructUndefined.construct(SafeConstructor.java:475)
	at org.yaml.snakeyaml.constructor.BaseConstructor.constructObject(BaseConstructor.java:183)
	at org.yaml.snakeyaml.constructor.BaseConstructor.constructMapping2ndStep(BaseConstructor.java:326)
	at org.yaml.snakeyaml.constructor.SafeConstructor.constructMapping2ndStep(SafeConstructor.java:143)
	at org.yaml.snakeyaml.constructor.BaseConstructor.constructMapping(BaseConstructor.java:307)
	at org.yaml.snakeyaml.constructor.SafeConstructor$ConstructYamlMap.construct(SafeConstructor.java:459)
	at org.bukkit.configuration.file.YamlConstructor$ConstructCustomObject.construct(YamlConstructor.java:26)
	at org.yaml.snakeyaml.constructor.BaseConstructor.constructObject(BaseConstructor.java:183)
	at org.yaml.snakeyaml.constructor.BaseConstructor.constructMapping2ndStep(BaseConstructor.java:326)
	at org.yaml.snakeyaml.constructor.SafeConstructor.constructMapping2ndStep(SafeConstructor.java:143)
	at org.yaml.snakeyaml.constructor.BaseConstructor.constructMapping(BaseConstructor.java:307)
	at org.yaml.snakeyaml.constructor.SafeConstructor$ConstructYamlMap.construct(SafeConstructor.java:459)
	at org.bukkit.configuration.file.YamlConstructor$ConstructCustomObject.construct(YamlConstructor.java:26)
	at org.yaml.snakeyaml.constructor.BaseConstructor.constructObject(BaseConstructor.java:183)
	at org.yaml.snakeyaml.constructor.BaseConstructor.constructMapping2ndStep(BaseConstructor.java:326)
	at org.yaml.snakeyaml.constructor.SafeConstructor.constructMapping2ndStep(SafeConstructor.java:143)
	at org.yaml.snakeyaml.constructor.BaseConstructor.constructMapping(BaseConstructor.java:307)
	at org.yaml.snakeyaml.constructor.SafeConstructor$ConstructYamlMap.construct(SafeConstructor.java:459)
	at org.bukkit.configuration.file.YamlConstructor$ConstructCustomObject.construct(YamlConstructor.java:26)
	at org.yaml.snakeyaml.constructor.BaseConstructor.constructObject(BaseConstructor.java:183)
	at org.yaml.snakeyaml.constructor.BaseConstructor.constructDocument(BaseConstructor.java:142)
	at org.yaml.snakeyaml.constructor.BaseConstructor.getSingleData(BaseConstructor.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(YamlConfiguration.java:53)
	... 15 more
2013-09-28 23:14:05 [INFO] [UltimateArena] Loaded 0 arena signs!