Playing around in minecraft singleplay with console, I discovered this error message when I placed a HV transformer. I get this every time I place a transformer (MV and LV as well). There is no crash, everything works.
[IC2] adding ic2.common.TileEntityTransformerHV@7e2e24b to the EnergyNet failed, already added: true
java.lang.Exception: Stack trace
at java.lang.Thread.dumpStack(Unknown Source)
at ic2.common.EnergyNet.addTileEntity(EnergyNet.java:139)
at ic2.common.TileEntityTransformer.onCreated(TileEntityTransformer.java:97)
at ic2.common.TileEntityBlock$1.tickCallback(TileEntityBlock.java:36)
at mod_IC2.tickStart(mod_IC2.java:1311)
at cpw.mods.fml.common.FMLCommonHandler.tickStart(FMLCommonHandler.java:110)
at cpw.mods.fml.client.FMLClientHandler.onPreWorldTick(FMLClientHandler.java:243)
at net.minecraft.client.Minecraft.k(Minecraft.java:1501)
at hq.k(MinecraftImpl.java:40)
at net.minecraft.client.Minecraft.x(Minecraft.java:822)
at net.minecraft.client.Minecraft.run(Minecraft.java:750)
at java.lang.Thread.run(Unknown Source)
