Major Error String Spam (Unknown Cause)

Hey guys, I need help identifying the cause of an error spam. I'm kind of stupid when it comes to servers, so please if you do answer, don't speak to me as if I'm a developer and I know what I'm doing lol. Speak to me as you would a child.

Code:

24.08 16:44:43 [Server] SEVERE at net.minecraft.server.MinecraftServer.saveChunks(MinecraftServer.java:326)
24.08 16:44:43 [Server] SEVERE at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:464)
24.08 16:44:43 [Server] SEVERE at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:479)
24.08 16:44:43 [Server] SEVERE at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
24.08 16:44:43 [Server] SEVERE at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:330)
24.08 16:44:43 [Server] SEVERE at java.lang.reflect.Method.invoke(Method.java:601)
24.08 16:44:43 [Server] SEVERE at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
24.08 16:44:43 [Server] SEVERE at sun.reflect.GeneratedMethodAccessor76.invoke(Unknown Source)
24.08 16:44:43 [Server] SEVERE at com.gmail.nossr50.listeners.WorldListener.onWorldSave(WorldListener.java:30)
24.08 16:44:43 [Server] SEVERE at com.gmail.nossr50.util.blockmeta.HashChunkletManager.saveWorld(HashChunkletManager.java:120)
24.08 16:44:43 [Server] SEVERE at com.gmail.nossr50.util.blockmeta.HashChunkletManager.serializeChunkletStore(HashChunkletManager.java:283)
24.08 16:44:43 [Server] SEVERE at java.io.FileOutputStream.<init>(FileOutputStream.java:165)
24.08 16:44:43 [Server] SEVERE at java.io.FileOutputStream.<init>(FileOutputStream.java:212)
24.08 16:44:43 [Server] SEVERE at java.io.FileOutputStream.open(Native Method)
24.08 16:44:43 [Server] SEVERE java.io.FileNotFoundException: ./world/mcmmo_data/61/-42/1 (Permission denied)

 

try updating java

 

Please post your full server.log

 

http://pastebin.com/0gu3wdVX

For the record it was doing it before I started rendering our world.

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

PHP:

##2012-08-24 19:37:28 [INFO] CraftBukkit++ for Minecraft 1.3.1 is initializing##
##2012-08-24 19:37:28 [INFO] CraftBukkit++ is a fork of the official CraftBukkit server mod for minecraft##
##2012-08-24 19:37:28 [INFO] CraftBukkit++ is a NOT AFFILIATED with the CraftBukkit project.##
##2012-08-24 19:37:28 [INFO] Please report any feedback or bugs to http://spout.in/cbpp##
##2012-08-24 19:37:28 [INFO] The source code for CraftBukkit++ is available on github.com##
##2012-08-24 19:37:28 [INFO] Default game type: SURVIVAL##
##2012-08-24 19:37:28 [INFO] Generating keypair##
##2012-08-24 19:37:29 [INFO] Starting CraftBukkit++ on 0.0.0.0:25565##
##2012-08-24 19:37:29 [INFO] This server is running CraftBukkit version git-Bukkit-1.3.1-b279jnks (MC: 1.3.1) (Implementing API version Unknown-Version)##
2012-08-24 19:37:29 [INFO] --------Setting up Storm Configuration--------

Eh? Are you using a modded/modified version of CraftBukkit?

 

Craftbukkit++

 

We don't support modified craftbukkit (nor can we, we don't know what the edits are)