Map Curruption :/ [tekkit 3.1.3] PLEASE HELP

[Conker5295]

Hey guys i just launched my server publicly yesterday and now im getting this error; i don't get it when the world file isn't in it and it makes a new one, any ideas?

2012-11-24 12:53:37 [sEVERE] java.lang.NoSuchMethodError: buildcraft.api.PowerProvider.receiveEnergy(I)V

2012-11-24 12:53:37 [sEVERE]at buildcraft.energy.TileEngine.q_(TileEngine.java:126)

2012-11-24 12:53:37 [sEVERE]at net.minecraft.server.World.tickEntities(World.java:1189)

2012-11-24 12:53:37 [sEVERE]at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:559)

2012-11-24 12:53:37 [sEVERE]at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:457)

2012-11-24 12:53:37 [sEVERE]at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)

2012-11-24 12:53:37 [sEVERE] Unexpected exception

java.lang.NoSuchMethodError: buildcraft.api.PowerProvider.receiveEnergy(I)V

at buildcraft.energy.TileEngine.q_(TileEngine.java:126)

at net.minecraft.server.World.tickEntities(World.java:1189)

at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:559)

at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:457)

at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)

If anyone has any suggestions please help!