----Minecraft Crash Report ----
// Sorry.
Time: 10.12.14 19:08
Description: Ticking screen
java.lang.NullPointerException
at java.io.ByteArrayInputStream.(Unknown Source)
at buildcraft.core.network.PacketHandler.onPacketData(PacketHandler.java:33)
at cpw.mods.fml.common.network.NetworkRegistry.handlePacket(NetworkRegistry.java:255)
at cpw.mods.fml.common.network.NetworkRegistry.handleCustomPacket(NetworkRegistry.java:245)
at cpw.mods.fml.common.network.FMLNetworkHandler.handlePacket250Packet(FMLNetworkHandler.java:84)
at net.minecraft.client.multiplayer.NetClientHandler.func_72501_a(NetClientHandler.java:1720)
at net.minecraft.network.packet.Packet250CustomPayload.func_73279_a(SourceFile:59)
at net.minecraft.network.TcpConnection.func_74428_b(TcpConnection.java:461)
at net.minecraft.client.multiplayer.NetClientHandler.func_72551_d(NetClientHandler.java:273)
at net.minecraft.client.multiplayer.GuiConnecting.func_73876_c(GuiConnecting.java:51)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1526)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:835)
at net.minecraft.client.Minecraft.run(Minecraft.java:760)
at java.lang.Thread.run(Unknown Source)
Поставь java 7 и переустанови mix-servers
