AdditionalPipes issue

2012-04-26 10:59:18 [SEVERE] java.lang.ArrayIndexOutOfBoundsException: 1
2012-04-26 10:59:18 [SEVERE] 	at buildcraft.core.ClassMapping.updateFromData(ClassMapping.java:445)
2012-04-26 10:59:18 [SEVERE] 	at buildcraft.core.network.TilePacketWrapper.fromPayload(TilePacketWrapper.java:135)
2012-04-26 10:59:18 [SEVERE] 	at buildcraft.transport.Pipe.handlePacket(Pipe.java:151)
2012-04-26 10:59:18 [SEVERE] 	at buildcraft.additionalpipes.network.NetworkHandler.onTelePipeDesc(NetworkHandler.java:63)
2012-04-26 10:59:18 [SEVERE] 	at buildcraft.additionalpipes.network.NetworkHandler.onPacketData(NetworkHandler.java:51)
2012-04-26 10:59:18 [SEVERE] 	at forge.MessageManager.dispatchIncomingMessage(MessageManager.java:431)
2012-04-26 10:59:18 [SEVERE] 	at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:1463)
2012-04-26 10:59:18 [SEVERE] 	at net.minecraft.server.Packet250CustomPayload.handle(SourceFile:46)
2012-04-26 10:59:18 [SEVERE] 	at net.minecraft.server.NetworkManager.b(NetworkManager.java:234)
2012-04-26 10:59:18 [SEVERE] 	at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:121)
2012-04-26 10:59:18 [SEVERE] 	at net.minecraft.server.NetworkListenThread.a(NetworkListenThread.java:78)
2012-04-26 10:59:18 [SEVERE] 	at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:556)
2012-04-26 10:59:18 [SEVERE] 	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:453)
2012-04-26 10:59:18 [SEVERE] 	at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)