Помогите Null java..

Вот у многих такая ошибка что делать??


java.lang.NullPointerException
at cpw.mods.fml.common.network.EntitySpawnPacket.execute(EntitySpawnPacket.java:177)
at cpw.mods.fml.common.network.FMLNetworkHandler.handleFMLPacket(FMLNetworkHandler.java:104)
at cpw.mods.fml.common.network.FMLNetworkHandler.handlePacket250Packet(FMLNetworkHandler.java:74)
at awr.a(NetClientHandler.java:1341)
at da.a(SourceFile:59)
at bx.b(TcpConnection.java:441)
at awr.d(NetClientHandler.java:104)
at awu.c(SourceFile:69)
at net.minecraft.client.Minecraft.l(Minecraft.java:1507)
at net.minecraft.client.Minecraft.J(Minecraft.java:854)
at net.minecraft.client.Minecraft.run(Minecraft.java:779)
at java.lang.Thread.run(Unknown Source)