ftb server crash

[INFO] Stopping server
2012-12-31 09:10:14 [INFO] Saving players
2012-12-31 09:10:14 [INFO] Saving worlds
2012-12-31 09:10:14 [INFO] Saving chunks for level 'world'/Overworld
2012-12-31 09:10:21 [INFO] Starting minecraft server version 1.4.6
2012-12-31 09:10:49 [INFO] Loading properties
2012-12-31 09:10:49 [INFO] Default game type: SURVIVAL
2012-12-31 09:10:49 [INFO] Generating keypair
2012-12-31 09:10:50 [INFO] Starting Minecraft server on *:25568
2012-12-31 09:10:59 [INFO] [Mekanism] Mod loaded.
2012-12-31 09:11:00 [INFO] [MekanismGenerators] Loaded module.
2012-12-31 09:11:00 [INFO] [MekanismTools] Loaded module.
2012-12-31 09:11:07 [INFO] Preparing level "world"
2012-12-31 09:11:08 [INFO] Preparing start region for level 0
2012-12-31 09:11:09 [INFO] Preparing spawn area: 32%
2012-12-31 09:11:10 [INFO] Preparing spawn area: 66%
2012-12-31 09:11:11 [INFO] Preparing spawn area: 97%
2012-12-31 09:11:11 [INFO] Done (4.234s)! For help, type "help" or "?"
2012-12-31 09:11:15 [SEVERE] Encountered an unexpected exception t
t: Ticking tile entity
	at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:685)
	at ho.r(DedicatedServer.java:270)
	at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:598)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:497)
	at fy.run(SourceFile:849)
Caused by: java.lang.NullPointerException
	at mekanism.common.TileEntitySmeltingFactory.canOperate(TileEntitySmeltingFactory.java:272)
	at mekanism.common.TileEntitySmeltingFactory.onUpdate(TileEntitySmeltingFactory.java:178)
	at mekanism.common.TileEntityBasicBlock.g(TileEntityBasicBlock.java:30)
	at yc.h(World.java:2155)
	at in.h(WorldServer.java:516)
	at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:679)
	... 4 more
2012-12-31 09:11:15 [SEVERE] This crash report has been saved to: /root/MindCrack_Server/./crash-reports/crash-2012-12-31_09.11.15-server.txt