java.lang.NoSuchMethodError: buildcraft.core.PersistentWorld.getWorld(Lte;)Lbuildcraft/core/PersistentWorld;
at buildcraft.transport.TileGenericPipe.bindPipe(TileGenericPipe.java:125)
at buildcraft.transport.TileGenericPipe.n(TileGenericPipe.java:81)
at jf.a(Chunk.java:612)
at jf.a(Chunk.java:590)
at pi.a(SourceFile:188)
at ix.a(SourceFile:42)
at ja.e(ChunkProviderServer.java:105)
at ja.c(ChunkProviderServer.java:56)
at ae.<init>(PlayerInstance.java:28)
at so.a(SourceFile:184)
at so.a(SourceFile:250)
at gm.c(SourceFile:95)
at fi.b(NetLoginHandler.java:121)
at fi.a(NetLoginHandler.java:41)
at dr.a(SourceFile:94)
at net.minecraft.server.MinecraftServer.h(MinecraftServer.java:369)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:287)
at ce.run(SourceFile:417)
That's what happens with the duping fix in SMP. You really should have taken the 30 seconds to test it...your fix is useless in SSP (someone duping there is just cheating themselves)