Looks like the same issue but with AE2 P2P tunnel
Description: Exception in server tick loop
java.lang.IllegalArgumentException: The tier value -2147483648 for LayerIPipeConnection_TileCableBus|E|0|177 (te appeng.parts.layers.LayerIPipeConnection_TileCableBus@358985fb) is invalid. at ic2.core.energy.Node.setTier(Node.java:68) at ic2.core.energy.Grid.prepareCalculation(Grid.java:261) at ic2.core.energy.EnergyNetLocal.onTickEnd(EnergyNetLocal.java:376) at ic2.core.energy.EnergyNetGlobal.onTickEnd(EnergyNetGlobal.java:66) at ic2.core.TickHandler.onWorldTick(TickHandler.java:77) at cpw.mods.fml.common.eventhandler.ASMEventHandler_12_TickHandler_onWorldTick_WorldTickEvent.invoke(.dynamic) at cpw.mods.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:51) at cpw.mods.fml.common.eventhandler.EventBus.post(EventBus.java:122) at cpw.mods.fml.common.FMLCommonHandler.onPostWorldTick(FMLCommonHandler.java:255) at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:645) at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:335) at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547) at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:427) at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)