getting weard error/warning

hello, i was updating my server for 1.4.6 and when i tried to start up this strange error/warning appeared

Code:

2012-12-27 12:18:35 [WARNING] Method "public Plugin loadPlugin(File, boolean)" is Deprecated, and may be removed in a future version of Bukkit
org.bukkit.plugin.AuthorNagException:
    at org.bukkit.plugin.java.JavaPluginLoader.getClassByName(JavaPluginLoader.java:284)
    at com.earth2me.essentials.storage.BukkitConstructor.getClassForNode(BukkitConstructor.java:418)
    at org.yaml.snakeyaml.constructor.Constructor$ConstructYamlObject.getConstructor(Constructor.java:321)
    at org.yaml.snakeyaml.constructor.Constructor$ConstructYamlObject.construct(Constructor.java:331)
    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:423)
    at com.earth2me.essentials.storage.YamlStorageReader.load(YamlStorageReader.java:47)
    at com.earth2me.essentials.storage.AbstractDelayedYamlFileReader.run(AbstractDelayedYamlFileReader.java:37)
    at org.bukkit.craftbukkit.v1_4_6.scheduler.CraftTask.run(CraftTask.java:53)
    at org.bukkit.craftbukkit.v1_4_6.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:53)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
2012-12-27 12:18:35 [WARNING] Method "public Plugin loadPlugin(File, boolean)" is Deprecated, and may be removed in a future version of Bukkit
org.bukkit.plugin.AuthorNagException:
    at org.bukkit.plugin.java.JavaPluginLoader.getClassByName(JavaPluginLoader.java:284)
    at com.earth2me.essentials.storage.BukkitConstructor.getClassForNode(BukkitConstructor.java:418)
    at org.yaml.snakeyaml.constructor.Constructor$ConstructYamlObject.getConstructor(Constructor.java:321)
    at org.yaml.snakeyaml.constructor.Constructor$ConstructYamlObject.construct(Constructor.java:331)
    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:423)
    at com.earth2me.essentials.storage.YamlStorageReader.load(YamlStorageReader.java:47)
    at com.earth2me.essentials.storage.AbstractDelayedYamlFileReader.run(AbstractDelayedYamlFileReader.java:37)
    at org.bukkit.craftbukkit.v1_4_6.scheduler.CraftTask.run(CraftTask.java:53)
    at org.bukkit.craftbukkit.v1_4_6.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:53)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)

i have the following plugins installed: dynmap , essentials (antibuild,chat,protect,spawn) , lockette, logblock, loginsecurity, orebfuscator, permissionsEx, playerheads, vault, world edit and world guard

please some help

 

Do you have the 1.4.6 WorldEdit and WorldGuard developer build?

 

i updated to the 1.4.6 dev build for world edit and guard but i still get the same error/warning

 

Update to the newest essentials build

 

thanks, the error disappeared