How disable spam from IC2EXP?

[23:04:00] [Server thread/WARN] [/]: java.util.concurrent.ExecutionException: java.lang.NullPointerException
[23:04:00] [Server thread/WARN] [/]: at java.util.concurrent.FutureTask.report(FutureTask.java:122)
[23:04:00] [Server thread/WARN] [/]: at java.util.concurrent.FutureTask.get(FutureTask.java:192)
[23:04:00] [Server thread/WARN] [/]: at ic2.core.energy.Grid.finishCalculation(Grid.java:360)
[23:04:00] [Server thread/WARN] [/]: at ic2.core.energy.EnergyNetLocal.onTickEnd(EnergyNetLocal.java:359)
[23:04:00] [Server thread/WARN] [/]: at ic2.core.energy.EnergyNetGlobal.onTickEnd(EnergyNetGlobal.java:68)
[23:04:00] [Server thread/WARN] [/]: at ic2.core.TickHandler.onWorldTick(TickHandler.java:77)
[23:04:00] [Server thread/WARN] [/]: at cpw.mods.fml.common.eventhandler.ASMEventHandler_9_TickHandler_onWorldTick_WorldTickEvent.invoke(.dynamic)
[23:04:00] [Server thread/WARN] [/]: at cpw.mods.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:54)
[23:04:00] [Server thread/WARN] [/]: at cpw.mods.fml.common.eventhandler.EventBus.post(EventBus.java:138)
[23:04:00] [Server thread/WARN] [/]: at cpw.mods.fml.common.FMLCommonHandler.onPostWorldTick(FMLCommonHandler.java:260)
[23:04:00] [Server thread/WARN] [/]: at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:963)
[23:04:00] [Server thread/WARN] [/]: at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:423)
[23:04:00] [Server thread/WARN] [/]: at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:798)
[23:04:00] [Server thread/WARN] [/]: at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:658)
[23:04:00] [Server thread/WARN] [/]: at java.lang.Thread.run(Thread.java:745)
[23:04:00] [Server thread/WARN] [/]: Caused by: java.lang.NullPointerException
[23:04:00] [Server thread/INFO] [/]: Grid 93818 info:
[23:04:00] [Server thread/INFO] [/]: 124 nodes
[23:04:00] [Server thread/INFO] [/]: Active: 1 sources -> 5 sinks
[23:04:00] [Server thread/INFO] [/]: 13 nodes after optimization
[23:04:00] [Server thread/INFO] [/]: 13 emitting nodes
[23:04:00] [Server thread/INFO] [/]: 5
[23:04:00] [Server thread/INFO] [/]: entries in cache, hitrate
[23:04:00] [Server thread/INFO] [/]: 97.47
[23:04:00] [Server thread/INFO] [/]: %
[23:04:00] [Server thread/INFO] [/]: Result matrix:
[23:04:00] [Server thread/INFO] [/]: Type = dense , numRows = 13 , numCols = 1
2761.141
2201.783
3198.700
716.137
665.965
516.998
520.431
421.268
2763.500
421.052
720.893
670.387
2252.848