With Bukkit 1.6.2

[gaRt3n]

2013-08-06 00:01:12 [INFO] Starting minecraft server version 1.6.2
2013-08-06 00:01:12 [INFO] Loading properties
2013-08-06 00:01:12 [INFO] Default game type: SURVIVAL
2013-08-06 00:01:12 [INFO] Generating keypair
2013-08-06 00:01:13 [INFO] Starting Minecraft server on Minecraft-WTF.de:25565
2013-08-06 00:01:14 [INFO] This server is running CraftBukkit version git-Bukkit-1.5.2-R1.0-34-gafd618a-b2822jnks (MC: 1.6.2) (Implementing API version 1.6.2-R0.1-SNAPSHOT)
2013-08-06 00:01:14 [INFO] ----- Bukkit Auto Updater -----
2013-08-06 00:01:14 [INFO] It appears that you're running a Development Build, when you've specified in bukkit.yml that you prefer to run Recommended Builds.
2013-08-06 00:01:14 [INFO] If you would like to be kept informed about new Development Build releases, it is recommended that you change 'preferred-channel' in your bukkit.yml to 'dev'.
2013-08-06 00:01:14 [INFO] With that set, you will be told whenever a new version is available for download, so that you can always keep up to date and secure with the latest fixes.
2013-08-06 00:01:14 [INFO] If you would like to disable this warning, simply set 'suggest-channels' to false in bukkit.yml.
2013-08-06 00:01:14 [INFO] ----- ------------------- -----
2013-08-06 00:01:17 [SEVERE] Could not load 'plugins/CreativeGates.jar' in folder 'plugins'
org.bukkit.plugin.UnknownDependencyException: mcore
at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:195)
at org.bukkit.craftbukkit.v1_6_R2.CraftServer.loadPlugins(CraftServer.java:239)
at org.bukkit.craftbukkit.v1_6_R2.CraftServer.(CraftServer.java:217)
at net.minecraft.server.v1_6_R2.PlayerList.(PlayerList.java:56)
at net.minecraft.server.v1_6_R2.DedicatedPlayerList.(SourceFile:11)
at net.minecraft.server.v1_6_R2.DedicatedServer.init(DedicatedServer.java:106)
at net.minecraft.server.v1_6_R2.MinecraftServer.run(MinecraftServer.java:391)
at net.minecraft.server.v1_6_R2.ThreadServerApplication.run(SourceFile:582)
2013-08-06 00:01:17 [INFO] [PermissionsEx] sql backend registered!
2013-08-06 00:01:17 [INFO] [PermissionsEx] file backend registered!
2013-08-06 00:01:17 [INFO] [PermissionsEx] PermissionEx plugin initialized.
2013-08-06 00:01:18 [INFO] [PlugMan] Loading PlugMan v1.8.4
2013-08-06 00:01:18 [INFO] [Buycraft] Loading Buycraft v5.7
2013-08-06 00:01:18 [INFO] [dynmap] Loading dynmap v1.8-786
2013-08-06 00:01:18 [INFO] [AutoMessage] Loading AutoMessage v2.3.1
2013-08-06 00:01:18 [INFO] [AdvGameMode] Loading AdvGameMode v2.1
2013-08-06 00:01:18 [INFO] [CompassEx] Loading CompassEx v3.0.2
2013-08-06 00:01:18 [INFO] [Nethrar] Loading Nethrar v2.3
2013-08-06 00:01:18 [INFO] [PetitionPlugin3] Loading PetitionPlugin3 v1.0
2013-08-06 00:01:18 [INFO] [Premium] Loading Premium v0.0.1
2013-08-06 00:01:18 [INFO] [PerWorldPlugins] Loading PerWorldPlugins v1.0.9
2013-08-06 00:01:18 [INFO] [OpenInv] Loading OpenInv v2.0.6
2013-08-06 00:01:18 [INFO] [ProtocolLib] Loading ProtocolLib v2.3.0
2013-08-06 00:01:19 [SEVERE] [ProtocolLib] INTERNAL ERROR: Cannot load ProtocolLib.
If this problem hasn't already been reported, please open a ticket
at http://dev.bukkit.org/server-mods/protocollib/ with the following data:
===== STACK TRACE =====
java.lang.IllegalStateException: Detected a newer version of ProtocolLib (2.5.0) in plugin folder than the current (2.3.0). Disabling.
at com.comphenix.protocol.ProtocolLibrary.checkConflictingVersions(ProtocolLibrary.java:342)
at com.comphenix.protocol.ProtocolLibrary.onLoad(ProtocolLibrary.java:133)
at org.bukkit.craftbukkit.v1_6_R2.CraftServer.loadPlugins(CraftServer.java:244)
at org.bukkit.craftbukkit.v1_6_R2.CraftServer.(CraftServer.java:217)
at net.minecraft.server.v1_6_R2.PlayerList.(PlayerList.java:56)
at net.minecraft.server.v1_6_R2.DedicatedPlayerList.(SourceFile:11)
at net.minecraft.server.v1_6_R2.DedicatedServer.init(DedicatedServer.java:106)
at net.minecraft.server.v1_6_R2.MinecraftServer.run(MinecraftServer.java:391)
at net.minecraft.server.v1_6_R2.ThreadServerApplication.run(SourceFile:582)
===== DUMP =====
Parameters:
[NULL]
Sender:
com.comphenix.protocol.ProtocolLibrary@6631c03[
statistisc=
backgroundCompiler=
asyncPacketTask=-1
tickCounter=0
unhookTask=
config=com.comphenix.protocol.ProtocolConfig@7d76e204
updater=
updateDisabled=false
logger=org.bukkit.plugin.PluginLogger@7f0b4f6
redirectHandler=
commandProtocol=
commandPacket=
skipDisable=true
isEnabled=false
initialized=true
loader=org.bukkit.plugin.java.JavaPluginLoader@57407ae8
server=CraftServer{serverName=CraftBukkit,serverVersion=git-Bukkit-1.5.2-R1.0-34-gafd618a-b2822jnks,minecraftVersion=1.6.2}
file=plugins/ProtocolLib-2.3.0.jar
description=org.bukkit.plugin.PluginDescriptionFile@8f65bc0
dataFolder=plugins/ProtocolLib
classLoader=org.bukkit.plugin.java.PluginClassLoader@6c2f06ab
naggable=true
ebean=
newConfig=YamlConfiguration[path='', root='YamlConfiguration']
configFile=plugins/ProtocolLib/config.yml
logger=org.bukkit.plugin.PluginLogger@7f0b4f6
]
Version:
ProtocolLib v2.3.0
Server:
git-Bukkit-1.5.2-R1.0-34-gafd618a-b2822jnks (MC: 1.6.2)

[aadnk]

Might want to delete ProtocolLib-2.3.0.jar in your plugins/ folder.

I'd also suggest upgrading to the latest version of ProtocolLib.