Solved Server won't restart.

[Kunzite]

Problem solved, tl;dr:
Server crashed.
Chunk duplicated itself and caused server to throw error. (Error was "WRONG LOCATION")
After both chunks were deleted the server was able to reboot and repairs to the world commenced.
-----------------------------------------------------------------

Hi, I am running a small (5-6 people at peak) private family server. Just moments ago the server experienced a hard lock/crash. It happened after we defeated the ender dragon at the exact moment someone jumped into the portal.

This is what the server is spamming in the cmd window while starting:
http://imageshack.us/photo/my-images/221/capturegh.jpg/

2013-03-05 02:13:36 [INFO] [STDERR] java.lang.Exception: Stack trace
2013-03-05 02:13:36 [INFO] [STDERR]    at java.lang.Thread.dumpStack(Unknown So
urce)
2013-03-05 02:13:36 [INFO] [STDERR]    at zz.a(Chunk.java:923)
2013-03-05 02:13:36 [INFO] [STDERR]    at aam.a(AnvilChunkLoader.java:406)
2013-03-05 02:13:36 [INFO] [STDERR]    at aam.a(AnvilChunkLoader.java:103)
2013-03-05 02:13:36 [INFO] [STDERR]    at aam.a(AnvilChunkLoader.java:83)
2013-03-05 02:13:36 [INFO] [STDERR]    at im.f(ChunkProviderServer.java:182)
2013-03-05 02:13:36 [INFO] [STDERR]    at im.c(ChunkProviderServer.java:118)
2013-03-05 02:13:36 [INFO] [STDERR]    at net.minecraft.server.MinecraftServer.
e(MinecraftServer.java:310)
2013-03-05 02:13:36 [INFO] [STDERR]    at net.minecraft.server.MinecraftServer.
a(MinecraftServer.java:284)
2013-03-05 02:13:36 [INFO] [STDERR]    at ho.c(DedicatedServer.java:180)
2013-03-05 02:13:57 [INFO] [STDERR]    at net.minecraft.server.MinecraftServer.
run(MinecraftServer.java:458)
2013-03-05 02:13:36 [INFO] [STDERR]    at fy.run(SourceFile:849)
2013-03-05 02:13:36 [INFO] [STDOUT] Wrong location! px['item.tile.cactus'/3466,
l='world', x=-272.63, y=63.13, z=429.88]

The only variation I can see in the repeat is the:
px['item.tile.cactus'/3466
seems to increment as it repeats.


I am unsure about how I could go about fixing this. Does anyone have any experience with saving worlds? Anyone have a direction they can point me in?

Thank you, in advance, for your time and assistance.

EDIT: Wow, How did I forget all the system info? Sorry.

OS: Windows 7 Home Premium, 64 bit
Local Server/Hamachi
System Specs: Core i5 3570k(stock clock), Sabertooth mobo, 16GBs of ram, Radeon 7870
FTB: Mindcrack 8.1.17870
No additional mods.

 

[Kunzite]

-Progress Report-
I noticed that there is a coordinate attached to the error. I am trying to use mcedit to remove the part causing the error. After deleting all entities, deleting the area around the item causing the error, as well as the entire chunk (in the middle of someone's house) there is still a green box at the exact location mentioned by the error that I cannot seem to remove from the world..

Still no success in loading this world in client or server.

Here is a .zip of the world if anyone would like to give it a crack...

http://www.mediafire.com/?hkdn3umh8aad8m1

 

[Kunzite]

Making this final post under the assumption that there are actually people who use this forum.

Problem solved:
I discovered that the chunk in which the error was pointing to duplicated itself to a few chunks away. After deleting both chunks in MCedit the server was able to load the world. Minor damage to 1 player's house.