[SEVERE] [Minecraft-Server] Encountered an unexpected exception ReportedException
net.minecraft.util.ReportedException: Ticking tile entity
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:672)
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)
Caused by: java.lang.AbstractMethodError
at buildcraft.transport.TileGenericPipe.canPipeConnect(TileGenericPipe.java:439)
at buildcraft.transport.TileGenericPipe.computeConnections(TileGenericPipe.java:469)
at buildcraft.transport.TileGenericPipe.func_70316_g(TileGenericPipe.java:167)
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)
... 4 more

That's what I get when I try to join my server... I don't know if it's a bug on your side, but I hope it get's fixed soon :(

From the readme (https://github.com/BuildCraft/BuildCraft#frequently-reported)

java.lang.AbstractMethodError - Incompatibility between BC/Forge/Mod using BC API. Usually not a BC issue

Unless it happens with ONLY BC installed, I'm closing this one.