SEVERE Error, Server Disintegrates?

Hey guys, so I was just intalling Oreobsuction (spelled SO wrong) anyways yea I installed it and logged in, the world does not appear and instantly the server crashes...This is the report that follows in the console

2012-08-20 19:58:14 [INFO] zanchee[/69.244.226.100:49614] logged in with entity id 1179 at ([mobarena] -75.77589019140679, 67.0338256610976, 366.10774516840996)
2012-08-20 19:58:15 [SEVERE] java.lang.NoSuchMethodError: net.minecraft.server.Chunk.h()[Lnet/minecraft/server/ChunkSection;
2012-08-20 19:58:15 [SEVERE]at net.minecraft.server.Packet51MapChunk.<init>(Packet51MapChunk.java:48)
2012-08-20 19:58:15 [SEVERE]at net.minecraft.server.EntityPlayer.h_(EntityPlayer.java:172)
2012-08-20 19:58:15 [SEVERE]at net.minecraft.server.World.entityJoinedWorld(World.java:1243)
2012-08-20 19:58:15 [SEVERE]at net.minecraft.server.WorldServer.entityJoinedWorld(WorldServer.java:498)
2012-08-20 19:58:15 [SEVERE]at net.minecraft.server.World.playerJoinedWorld(World.java:1225)
2012-08-20 19:58:15 [SEVERE]at net.minecraft.server.World.tickEntities(World.java:1123)
2012-08-20 19:58:15 [SEVERE]at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:565)
2012-08-20 19:58:15 [SEVERE]at net.minecraft.server.DedicatedServer.q(DedicatedServer.java:212)
2012-08-20 19:58:15 [SEVERE]at net.minecraft.server.MinecraftServer.p(MinecraftServer.java:474)
2012-08-20 19:58:15 [SEVERE]at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:406)
2012-08-20 19:58:15 [SEVERE]at net.minecraft.server.ThreadServerApplication.run(SourceFile:539)
2012-08-20 19:58:15 [SEVERE] Encountered an unexpected exception NoSuchMethodError
java.lang.NoSuchMethodError: net.minecraft.server.Chunk.h()[Lnet/minecraft/server/ChunkSection;
at net.minecraft.server.Packet51MapChunk.<init>(Packet51MapChunk.java:48)
at net.minecraft.server.EntityPlayer.h_(EntityPlayer.java:172)
at net.minecraft.server.World.entityJoinedWorld(World.java:1243)
at net.minecraft.server.WorldServer.entityJoinedWorld(WorldServer.java:498)
at net.minecraft.server.World.playerJoinedWorld(World.java:1225)
at net.minecraft.server.World.tickEntities(World.java:1123)
at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:565)
at net.minecraft.server.DedicatedServer.q(DedicatedServer.java:212)
at net.minecraft.server.MinecraftServer.p(MinecraftServer.java:474)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:406)
at net.minecraft.server.ThreadServerApplication.run(SourceFile:539)
2012-08-20 19:58:15 [SEVERE] This crash report has been saved to: C:\Users\Administrator\Desktop\1.3 Server\.\crash-reports\crash-2012-08-20_19.58.15-server.txt
Please help this seems really dire and I cant get it running again...my players are waiting...

 

Looks like Orebfuscator is encountering a block ID it doesn't know how to deal with, and this is "going away" in response. What other plugins are you using, and what item is using block ID 1179?