Just started getting this on our SMP server after only being up for a day fresh map. Only other mod is BC 2.2.2 and its disabled so you can't place blocks just forms oil.
Code
13:15:18 [SEVERE] java.lang.NullPointerException
13:15:18 [SEVERE] at ic2.common.EnergyNet.discover(EnergyNet.java:484)
13:15:18 [SEVERE] at ic2.common.EnergyNet.emitEnergyFrom(EnergyNet.java:193)
13:15:18 [SEVERE] at ic2.common.TileEntityTransformer.h_(TileEntityTransformer.java:68)
13:15:18 [SEVERE] at net.minecraft.server.World.tickEntities(World.java:1116)
13:15:18 [SEVERE] at net.minecraft.server.MinecraftServer.h(MinecraftServer.java:473)
13:15:18 [SEVERE] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:380)
13:15:18 [SEVERE] at net.minecraft.server.ThreadServerApplication.run(SourceFile:417)
13:15:18 [SEVERE] Unexpected exception
java.lang.NullPointerException
at ic2.common.EnergyNet.discover(EnergyNet.java:484)
at ic2.common.EnergyNet.emitEnergyFrom(EnergyNet.java:193)
at ic2.common.TileEntityTransformer.h_(TileEntityTransformer.java:68)
at net.minecraft.server.World.tickEntities(World.java:1116)
at net.minecraft.server.MinecraftServer.h(MinecraftServer.java:473)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:380)
at net.minecraft.server.ThreadServerApplication.run(SourceFile:417)