Let me start by saying that i have never made an multiplayer mod before and now im trying to make my mod multiplayer compatible. I have read that forge does most of the work but i have clearly done something wrong.

 

When i start the server i get this error:

[iNFO] Starting minecraft server version 1.4.7
[sEVERE] Encountered an unexpected exception NoClassDefFoundError
java.lang.NoClassDefFoundError: net/minecraft/client/renderer/entity/Render
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at cpw.mods.fml.common.FMLModContainer.constructMod(FMLModContainer.java:416)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:69)
at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:317)
at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:300)
at com.google.common.eventbus.EventBus.post(EventBus.java:268)
at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:140)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:69)
at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:317)
at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:300)
at com.google.common.eventbus.EventBus.post(EventBus.java:268)
at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:83)
at cpw.mods.fml.common.Loader.loadMods(Loader.java:479)
at cpw.mods.fml.server.FMLServerHandler.beginServerLoading(FMLServerHandler.java:86)
at cpw.mods.fml.common.FMLCommonHandler.onServerStart(FMLCommonHandler.java:345)
at net.minecraft.server.dedicated.DedicatedServer.startServer(DedicatedServer.java:64)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:458)
at net.minecraft.server.ThreadMinecraftServer.run(ThreadMinecraftServer.java:16)
Caused by: java.lang.ClassNotFoundException: net.minecraft.client.renderer.entity.Render
at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:185)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 29 more
Caused by: java.lang.RuntimeException: Attempted to load class net/minecraft/client/renderer/entity/Render for invalid side SERVER
at cpw.mods.fml.common.asm.transformers.SideTransformer.transform(SideTransformer.java:38)
at cpw.mods.fml.relauncher.RelaunchClassLoader.runTransformers(RelaunchClassLoader.java:228)
at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:173)
... 31 more
[sEVERE] This crash report has been saved to: C:\Users\Oscar\Desktop\1.4.7 SMP\jars\.\crash-reports\crash-2013-01-16_18.36.15-server.txt

This is my mod_x

import java.util.Map;

import javax.crypto.Mac;

import net.minecraft.block.Block;
import net.minecraft.client.model.ModelBiped;
import net.minecraft.client.renderer.entity.RenderBiped;
import net.minecraft.client.renderer.entity.RenderLiving;
import net.minecraft.entity.Entity;
import net.minecraft.entity.EntityEggInfo;
import net.minecraft.entity.EntityList;
import net.minecraft.entity.EnumCreatureType;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;
import net.minecraft.world.biome.BiomeGenBase;
import net.minecraftforge.common.Configuration;
import cpw.mods.fml.client.registry.RenderingRegistry;
import cpw.mods.fml.common.Mod;
import cpw.mods.fml.common.Mod.Init;
import cpw.mods.fml.common.Mod.PreInit;
import cpw.mods.fml.common.SidedProxy;
import cpw.mods.fml.common.event.FMLInitializationEvent;
import cpw.mods.fml.common.event.FMLPreInitializationEvent;
import cpw.mods.fml.common.network.NetworkMod;
import cpw.mods.fml.common.registry.EntityRegistry;
import cpw.mods.fml.common.registry.GameRegistry;
import cpw.mods.fml.common.registry.LanguageRegistry;

@Mod(modid="Castle Defenders", name ="Castle Defenders",version="1.0.0")
@NetworkMod(clientSideRequired = true, serverSideRequired = false)



public class mod_castledef 
{
public static Block BlockKnight;
public static Block BlockArcher;
public static Block BlockMerc;
public static Block BlockEKnight;
public static Block BlockEArcher;

public static Item ItemMedallion;

public static int defenderID;
public static int knightID;
public static int archerID;
public static int mercID;
public static int EknightID ;
public static int EarcherID;	

public static int BlockKnightID;
public static int BlockArcherID;
public static int BlockMercID;
public static int BlockEKnightID;
public static int BlockEArcherID;
public static int MedallionID;

public static int CastleSpawnRaste;
public static int MercSpawnRate;

@SidedProxy(clientSide="CastleDef.ClientProxyCastleDef", serverSide = "CastleDef.ClientProxyCastleDef")
public static CommonProxyCastleDef proxy;

@PreInit
public void PreLoad(FMLPreInitializationEvent event)
{
Configuration config = new Configuration(event.getSuggestedConfigurationFile());

config.load();

BlockKnightID = config.get("BlockKnightID", Configuration.CATEGORY_BLOCK, 238).getInt();
BlockArcherID = config.get("BlockArcherID", Configuration.CATEGORY_BLOCK, 239).getInt();
BlockMercID = config.get("BlockMercID", Configuration.CATEGORY_BLOCK, 234).getInt();
BlockEKnightID = config.get("BlockEKnightID", Configuration.CATEGORY_BLOCK, 237).getInt();
BlockEArcherID = config.get("BlockEArcherID", Configuration.CATEGORY_BLOCK, 236).getInt();

MedallionID = config.get("MedallionID", Configuration.CATEGORY_ITEM, 3001).getInt();


defenderID = config.get("defenderID", Configuration.CATEGORY_GENERAL, -11).getInt();
knightID = config.get("knightID", Configuration.CATEGORY_GENERAL, -12).getInt();
archerID = config.get("archerID", Configuration.CATEGORY_GENERAL, -13).getInt();
mercID = config.get("mercID", Configuration.CATEGORY_GENERAL, -14).getInt();
EknightID = config.get("EknightID", Configuration.CATEGORY_GENERAL, -15).getInt();
EarcherID= config.get("EarcherID", Configuration.CATEGORY_GENERAL, -16).getInt();


CastleSpawnRaste = config.get("CastleSpawnRaste", Configuration.CATEGORY_GENERAL, 4).getInt();
MercSpawnRate = config.get("MercSpawnRate", Configuration.CATEGORY_GENERAL, 4).getInt();
config.save();
}


static int startEntityId = 300;


@Init
public void load(FMLInitializationEvent event)
{
  proxy.registerRenderThings();
  
  ItemMedallion=(new ItemMedallion(MedallionID)).setItemName("Medallion").setIconIndex(7);
  LanguageRegistry.addName(ItemMedallion, "Medallion");
  
  BlockKnight=(new BlockKnight(BlockKnightID,0)).setBlockName("BlockKnight").setHardness(2F).setResistance(5F);
  GameRegistry.registerBlock(BlockKnight);
  LanguageRegistry.addName(BlockKnight,"Knight Spawner"); 
  GameRegistry.registerTileEntity(TileEntityBlockKnight.class, "Knight Block");
  
  BlockArcher=(new BlockArcher(BlockArcherID,1)).setBlockName("BlockArcher").setHardness(2F).setResistance(5F);
  GameRegistry.registerBlock(BlockArcher);
  LanguageRegistry.addName(BlockArcher,"Archer Spawner"); 
  GameRegistry.registerTileEntity(TileEntityBlockArcher.class, "BlockArcher");
  
  BlockMerc=(new BlockMerc(BlockMercID,0)).setBlockName("BlockMerc").setHardness(2F).setResistance(5F);
GameRegistry.registerBlock(BlockMerc);
LanguageRegistry.addName(BlockMerc, "Merc Spawner");
GameRegistry.registerTileEntity(TileEntityBlockMerc.class, "Merc Block");

BlockEKnight=(new BlockEKnight(BlockEKnightID,6)).setBlockName("BlockEKnight").setHardness(2F).setResistance(5F);
GameRegistry.registerBlock(BlockEKnight);
LanguageRegistry.addName(BlockEKnight,"Enemy Knight Spawner"); 
GameRegistry.registerTileEntity(TileEntityBlockEKnight.class, "Enemy Knight Block");

BlockEArcher=(new BlockEArcher(BlockEArcherID,5)).setBlockName("BlockEArcher").setHardness(2F).setResistance(5F);
GameRegistry.registerBlock(BlockEArcher);
LanguageRegistry.addName(BlockEArcher, "Enemy Archer Spawner");
GameRegistry.registerTileEntity(TileEntityBlockEArcher.class, "Enemy Archer Block");


  	GameRegistry.addRecipe(new ItemStack(BlockKnight,1), new Object [] {
  	" X ","XYX"," X ", Character.valueOf('X'), Item.ingotIron,Character.valueOf('Y'), Item.swordSteel
});
GameRegistry.addRecipe(new ItemStack(BlockArcher,1), new Object [] {
" X ","XYX"," X ", Character.valueOf('X'), Item.ingotIron,Character.valueOf('Y'), Item.bow
});


  EntityRegistry.registerGlobalEntityID(EntityDefender.class, "Defender", defenderID);

  EntityRegistry.registerGlobalEntityID(EntityKnight.class, "Knight", knightID);
  EntityRegistry.addSpawn(EntityKnight.class, 10, 0, 0, EnumCreatureType.creature, BiomeGenBase.desert, BiomeGenBase.desertHills, BiomeGenBase.extremeHills, BiomeGenBase.extremeHillsEdge, BiomeGenBase.forest, BiomeGenBase.forestHills, BiomeGenBase.frozenOcean ,BiomeGenBase.frozenRiver, BiomeGenBase.hell, BiomeGenBase.iceMountains, BiomeGenBase.icePlains, BiomeGenBase.jungle, BiomeGenBase.jungleHills, BiomeGenBase.mushroomIsland, BiomeGenBase.mushroomIslandShore, BiomeGenBase.ocean, BiomeGenBase.plains, BiomeGenBase.river, BiomeGenBase.sky, BiomeGenBase.swampland, BiomeGenBase.taiga, BiomeGenBase.taigaHills);
  LanguageRegistry.instance().addStringLocalization("entity.Castle Defenders.Knight.name", "Knight");
  registerEntityEgg(EntityKnight.class, 0xffffff, 0x000000);
  
  EntityRegistry.registerGlobalEntityID(EntityArcher.class, "Archer", archerID);
  EntityRegistry.addSpawn(EntityArcher.class, 10, 0, 0, EnumCreatureType.creature, BiomeGenBase.desert, BiomeGenBase.desertHills, BiomeGenBase.extremeHills, BiomeGenBase.extremeHillsEdge, BiomeGenBase.forest, BiomeGenBase.forestHills, BiomeGenBase.frozenOcean ,BiomeGenBase.frozenRiver, BiomeGenBase.hell, BiomeGenBase.iceMountains, BiomeGenBase.icePlains, BiomeGenBase.jungle, BiomeGenBase.jungleHills, BiomeGenBase.mushroomIsland, BiomeGenBase.mushroomIslandShore, BiomeGenBase.ocean, BiomeGenBase.plains, BiomeGenBase.river, BiomeGenBase.sky, BiomeGenBase.swampland, BiomeGenBase.taiga, BiomeGenBase.taigaHills);
  LanguageRegistry.instance().addStringLocalization("entity.Castle Defenders.Archer.name", "Archer");
  registerEntityEgg(EntityArcher.class, 0xffffff, 0x500000);
  
  EntityRegistry.registerGlobalEntityID(EntityMerc.class, "Merc", mercID);
  EntityRegistry.addSpawn(EntityMerc.class, 10, 0, 0, EnumCreatureType.creature, BiomeGenBase.desert, BiomeGenBase.desertHills, BiomeGenBase.extremeHills, BiomeGenBase.extremeHillsEdge, BiomeGenBase.forest, BiomeGenBase.forestHills, BiomeGenBase.frozenOcean ,BiomeGenBase.frozenRiver, BiomeGenBase.hell, BiomeGenBase.iceMountains, BiomeGenBase.icePlains, BiomeGenBase.jungle, BiomeGenBase.jungleHills, BiomeGenBase.mushroomIsland, BiomeGenBase.mushroomIslandShore, BiomeGenBase.ocean, BiomeGenBase.plains, BiomeGenBase.river, BiomeGenBase.sky, BiomeGenBase.swampland, BiomeGenBase.taiga, BiomeGenBase.taigaHills);
  
  EntityRegistry.registerGlobalEntityID(EntityEKnight.class, "Enemy Knight", EknightID);
  EntityRegistry.addSpawn(EntityEKnight.class, 10, 0, 0, EnumCreatureType.creature, BiomeGenBase.desert, BiomeGenBase.desertHills, BiomeGenBase.extremeHills, BiomeGenBase.extremeHillsEdge, BiomeGenBase.forest, BiomeGenBase.forestHills, BiomeGenBase.frozenOcean ,BiomeGenBase.frozenRiver, BiomeGenBase.hell, BiomeGenBase.iceMountains, BiomeGenBase.icePlains, BiomeGenBase.jungle, BiomeGenBase.jungleHills, BiomeGenBase.mushroomIsland, BiomeGenBase.mushroomIslandShore, BiomeGenBase.ocean, BiomeGenBase.plains, BiomeGenBase.river, BiomeGenBase.sky, BiomeGenBase.swampland, BiomeGenBase.taiga, BiomeGenBase.taigaHills);
  
  EntityRegistry.registerGlobalEntityID(EntityEArcher.class, "Enemy Archer", EarcherID);
  EntityRegistry.addSpawn(EntityEArcher.class, 10, 0, 0, EnumCreatureType.creature, BiomeGenBase.desert, BiomeGenBase.desertHills, BiomeGenBase.extremeHills, BiomeGenBase.extremeHillsEdge, BiomeGenBase.forest, BiomeGenBase.forestHills, BiomeGenBase.frozenOcean ,BiomeGenBase.frozenRiver, BiomeGenBase.hell, BiomeGenBase.iceMountains, BiomeGenBase.icePlains, BiomeGenBase.jungle, BiomeGenBase.jungleHills, BiomeGenBase.mushroomIsland, BiomeGenBase.mushroomIslandShore, BiomeGenBase.ocean, BiomeGenBase.plains, BiomeGenBase.river, BiomeGenBase.sky, BiomeGenBase.swampland, BiomeGenBase.taiga, BiomeGenBase.taigaHills);
  
  GameRegistry.registerWorldGenerator(new WorldGeneratorMercbase());
  GameRegistry.registerWorldGenerator(new WorldGeneratorCastle());
  
  RenderingRegistry.registerEntityRenderingHandler(EntityKnight.class, new RenderBiped(new ModelBiped(), 0.5F));
  RenderingRegistry.registerEntityRenderingHandler(EntityArcher.class, new RenderBiped(new ModelBiped(), 0.5F));
  RenderingRegistry.registerEntityRenderingHandler(EntityMerc.class, new RenderBiped(new ModelBiped(), 0.5F));
  RenderingRegistry.registerEntityRenderingHandler(EntityEKnight.class, new RenderBiped(new ModelBiped(), 0.5F));
  RenderingRegistry.registerEntityRenderingHandler(EntityEArcher.class, new RenderBiped(new ModelBiped(), 0.5F));
}
public static int getUniqueEntityId() 
{
  do 
  {
   startEntityId++;
  } 
  while (EntityList.getStringFromID(startEntityId) != null);

   return startEntityId;
}

public static void registerEntityEgg(Class<? extends Entity> entity, int primaryColor, int secondaryColor) 
{
  int id = getUniqueEntityId();
  EntityList.IDtoClassMapping.put(id, entity);
  EntityList.entityEggs.put(id, new EntityEggInfo(id, primaryColor, secondaryColor));
}



}

 

I would really appriciate any help or tips.

 

Thanks!

 

 

 

All your RenderingRegistry calls need to go in your proxy, as you are trying to reference a render file on the server!

That makes sense. Thanks!