Using BC 4.0.1

Was connecting pipes on a server when this error occured. Server cannot come back up, error just pops up and server drops again.

---- Minecraft Crash Report ----
// This is a token for 1 free hug. Redeem at your nearest Mojangsta: [HUG]

Time: 8/10/13 4:36 PM
Description: Ticking tile entity

java.lang.AbstractMethodError
at buildcraft.transport.PipeTransportPower.canPipeConnect(PipeTransportPower.java:90)
at buildcraft.transport.Pipe.canPipeConnect(Pipe.java:91)
at buildcraft.transport.TileGenericPipe.canPipeConnect(TileGenericPipe.java:456)
at buildcraft.transport.TileGenericPipe.computeConnections(TileGenericPipe.java:469)
at buildcraft.transport.TileGenericPipe.initialize(TileGenericPipe.java:276)
at buildcraft.transport.TileGenericPipe.func_70316_g(TileGenericPipe.java:160)
at net.minecraft.world.World.func_72939_s(World.java:2204)
at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:548)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:666)
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:275)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:585)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:482)
at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:582)

A detailed walkthrough of the error, its code path and all known details is as follows:

-- Head --
Stacktrace:
at buildcraft.transport.PipeTransportPower.canPipeConnect(PipeTransportPower.java:90)
at buildcraft.transport.Pipe.canPipeConnect(Pipe.java:91)
at buildcraft.transport.TileGenericPipe.canPipeConnect(TileGenericPipe.java:456)
at buildcraft.transport.TileGenericPipe.computeConnections(TileGenericPipe.java:469)
at buildcraft.transport.TileGenericPipe.initialize(TileGenericPipe.java:276)
at buildcraft.transport.TileGenericPipe.func_70316_g(TileGenericPipe.java:160)

-- Tile entity being ticked --
Details:
Name: net.minecraft.src.buildcraft.transport.GenericPipe // buildcraft.transport.TileGenericPipe
Block type: ID #1443 (tile.pipeBlock // buildcraft.transport.BlockGenericPipe)
Block data value: 0 / 0x0 / 0b0000
Block location: World: (-144,30,-160), Chunk: (at 0,1,0 in -9,-10; contains blocks -144,0,-160 to -129,255,-145), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
Actual block type: ID #1443 (tile.pipeBlock // buildcraft.transport.BlockGenericPipe)
Actual block data value: 0 / 0x0 / 0b0000
Stacktrace:
at net.minecraft.world.World.func_72939_s(World.java:2204)
at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:548)

-- Affected level --
Details:
Level name: world
All players: 0 total; []
Chunk stats: ServerChunkCache: 625 Drop: 0
Level seed: 202961
Level generator: ID 00 - default, ver 1. Features enabled: true
Level generator options:
Level spawn location: World: (0,65,0), Chunk: (at 0,4,0 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 18560950 game time, 14336072 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 36146 (now: false), thunder time: 2267 (now: true)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: true
Stacktrace:
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:666)
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:275)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:585)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:482)
at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:582)

Further investigation reveals that this happened when someone placed a stone power pipe next to a gregtech machine. Thermal generator I think.

I refer you to the frequently reported section in the readme
https://github.com/BuildCraft/BuildCraft#frequently-reported

Ah, sorry. Probably a gregtech issue.