Problem Server crashes when starting up - possible world corruption

[CathalCraft]

When I try to start my Monster v1.1.2 server it crashes.

Here is what it says in the log file: http://pastebin.com/3P6V7vNf
Crash-report: http://pastebin.com/wUm6sA7U

I do not have a backup of the world, yes I know, shame on me.

Is my world completely owned? Is there any way to try to fix it? I deleted level.dat and forcedchunks.dat in the biomesop world folder and it still won't start.

 

[Wagon153]

Does it happen without Cauldron(MCPC) installed?

 

[CathalCraft]

Does it happen without Cauldron(MCPC) installed?

It starts fine without Cauldron. But spawn is completely ruined. Haven't seen other parts of the world yet. It looks as if it removed every modded block from spawn.

I then tried to start with Cauldron again afterwards and it still crashes on startup.

 

[silentrob]

It starts fine without Cauldron. But spawn is completely ruined. Haven't seen other parts of the world yet. It looks as if it removed every modded block from spawn.

I then tried to start with Cauldron again afterwards and it still crashes on startup.

It sounds like you started with a vanilla server jar. Hopefully you backed up the world first, because otherwise those modded blocks are gone for good. Assuming you do have a backup, try restoring it and start up with a forge server jar.