I'm currently in the process of porting my mod from 1.6x to 1.7.10, and one of my bug testers is reporting the following error(s)

 

Error #1

java.lang.NoSuchMethodError: net.minecraft.network.play.server.S35PacketUpdateTileEntity.func_148857_g()Lnet/minecraft/nbt/NBTTagCompound;
at com.theoriginalbit.moarperipherals.common.tile.TileKeyboard.func_145844_m(TileKeyboard.java:70)
at net.minecraft.entity.player.EntityPlayerMP.func_147097_b(EntityPlayerMP.java:540)
at net.minecraft.entity.player.EntityPlayerMP.func_70071_h_(EntityPlayerMP.java:276)
at net.minecraft.world.World.func_72866_a(World.java:2068)
at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:648)
at net.minecraft.world.World.func_72870_g(World.java:2032)
at net.minecraft.world.World.func_72939_s(World.java:1885)
at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:489)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:636)
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:334)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:427)
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)

 

Error #2

java.lang.NoSuchMethodError: net.minecraft.network.play.server.S35PacketUpdateTileEntity.func_148857_g()Lnet/minecraft/nbt/NBTTagCompound;
at com.theoriginalbit.moarperipherals.common.tile.TileKeyboard.func_145844_m(TileKeyboard.java:70)
at net.minecraft.server.management.PlayerManager$PlayerInstance.func_151252_a(PlayerManager.java:591)
at net.minecraft.server.management.PlayerManager$PlayerInstance.func_73254_a(PlayerManager.java:533)
at net.minecraft.server.management.PlayerManager.func_72693_b(PlayerManager.java:67)
at net.minecraft.world.WorldServer.func_72835_b(WorldServer.java:185)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:625)
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:334)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:427)
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)

 

This problem only seems to occur in SMP, with no problems in SSP, and I can't quite figure out what is going on at all. Here is a link to the code:

https://github.com/theoriginalbit/MoarPeripherals/blob/master/src/main/java/com/theoriginalbit/moarperipherals/common/tile/TileKeyboard.java#L70

 

Any suggestions and/or help with this would be very appreciated

From the S35PacketUpdateTileEntity:

@SideOnly(Side.CLIENT)
public NBTTagCompound func_148857_g()
{
    return this.field_148860_e;
}

The

getDescriptionPacket()

is called server side, but you are trying to access a method that only exists client-side (

@SideOnly(Side.CLIENT)

. To solve this is, in the

getDescriptionPacket()

method don't call

packet.func_148857_g()

, but create your own NBTTagCompound (

NBTTagCompound tag = new NBTTagCompound()

).

From the S35PacketUpdateTileEntity:

@SideOnly(Side.CLIENT)
public NBTTagCompound func_148857_g()
{
    return this.field_148860_e;
}

The

getDescriptionPacket()

is called server side, but you are trying to access a method that only exists client-side (

@SideOnly(Side.CLIENT)

. To solve this is, in the

getDescriptionPacket()

method don't call

packet.func_148857_g()

, but create your own NBTTagCompound (

NBTTagCompound tag = new NBTTagCompound()

).

Oh of course! thank you so much!