Server error, possible Java related

[alan1180]

Title: Server error, possible Java related

Version: 3.1.2

OS: Mac OSX 10.8.2

Java Version: SE 6

Description of Problem:

Whilst playing on the server the error below came up and now i can't connect to the server?

Error Messages:

04:08:51 [sEVERE] java.lang.NoSuchMethodError: buildcraft.api.PowerProvider.receiveEnergy(I)V

04:08:51 [sEVERE] at buildcraft.energy.TileEngine.q_(TileEngine.java:126)

04:08:51 [sEVERE] at net.minecraft.server.World.tickEntities(World.java:1189)

04:08:51 [sEVERE] at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:559)

04:08:51 [sEVERE] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:457)

04:08:51 [sEVERE] at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)

04:08:51 [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)

Error Log: