Probleme with server side.

Hello I do not understand where in the following code it is the problem goes very well in solo but madecrash landing the waiter in multi

import net.minecraftforge.fml.client.registry.*;
import net.minecraftforge.fml.common.*;
import net.minecraftforge.fml.common.asm.*;
import net.minecraftforge.fml.common.asm.transformers.*;
import net.minecraftforge.fml.common.discovery.*;
import net.minecraftforge.fml.common.discovery.asm.*;
import net.minecraftforge.fml.common.event.*;
import net.minecraftforge.fml.common.functions.*;
import net.minecraftforge.fml.common.network.*;
import net.minecraftforge.fml.common.registry.*;
import net.minecraftforge.fml.common.toposort.*;
import net.minecraftforge.fml.common.versioning.*;
import net.minecraftforge.fml.relauncher.*;
import net.minecraftforge.fml.server.*;
import net.minecraft.block.*;
import net.minecraft.block.material.*;
import net.minecraft.client.*;
import net.minecraft.client.audio.*;
import net.minecraft.client.entity.*;
import net.minecraft.client.gui.*;
import net.minecraft.client.gui.achievement.*;
import net.minecraft.client.gui.inventory.*;
import net.minecraft.client.model.*;
import net.minecraft.client.multiplayer.*;
import net.minecraft.client.particle.*;
import net.minecraft.client.renderer.*;
import net.minecraft.client.renderer.culling.*;
import net.minecraft.client.renderer.entity.*;
import net.minecraft.client.renderer.tileentity.*;
import net.minecraft.client.settings.*;
import net.minecraft.command.*;
import net.minecraft.crash.*;
import net.minecraft.creativetab.*;
import net.minecraft.dispenser.*;
import net.minecraft.enchantment.*;
import net.minecraft.entity.*;
import net.minecraft.entity.ai.*;
import net.minecraft.entity.boss.*;
import net.minecraft.entity.effect.*;
import net.minecraft.entity.item.*;
import net.minecraft.entity.monster.*;
import net.minecraft.entity.passive.*;
import net.minecraft.entity.player.*;
import net.minecraft.entity.projectile.*;
import net.minecraft.inventory.*;
import net.minecraft.item.*;
import net.minecraft.item.crafting.*;
import net.minecraft.nbt.*;
import net.minecraft.network.*;
import net.minecraft.network.rcon.*;
import net.minecraft.pathfinding.*;
import net.minecraft.potion.*;
import net.minecraft.profiler.*;
import net.minecraft.server.*;
import net.minecraft.server.dedicated.*;
import net.minecraft.server.gui.*;
import net.minecraft.server.integrated.*;
import net.minecraft.server.management.*;

import net.minecraft.stats.*;
import net.minecraft.tileentity.*;
import net.minecraft.util.*;
import net.minecraft.village.*;
import net.minecraft.world.*;
import net.minecraft.world.biome.*;
import net.minecraft.world.chunk.*;
import net.minecraft.world.chunk.storage.*;
import net.minecraft.world.demo.*;
import net.minecraft.world.gen.*;
import net.minecraft.world.gen.feature.*;
import net.minecraft.world.gen.layer.*;
import net.minecraft.world.gen.structure.*;
import net.minecraft.world.storage.*;
import net.minecraftforge.classloading.*;
import net.minecraftforge.client.*;
import net.minecraftforge.client.event.*;
import net.minecraftforge.client.event.sound.*;
import net.minecraftforge.common.*;
import net.minecraftforge.event.*;
import net.minecraftforge.event.entity.*;
import net.minecraftforge.event.entity.item.*;
import net.minecraftforge.event.entity.living.*;
import net.minecraftforge.event.entity.minecart.*;
import net.minecraftforge.event.entity.player.*;
import net.minecraftforge.event.terraingen.*;
import net.minecraftforge.event.world.*;
import net.minecraftforge.oredict.*;
import net.minecraftforge.transformers.*;
import net.minecraft.init.*;
import java.util.*;

@SuppressWarnings("unchecked")
public class mcreator_panda {

public static int mobid = 0;
public Object instance;

    public void load(FMLInitializationEvent event){

	RenderingRegistry.registerEntityRenderingHandler(mcreator_panda.Entitypanda.class, new RenderLiving(Minecraft.getMinecraft().getRenderManager(), new ModelPig(), 0){protected ResourceLocation getEntityTexture(Entity par1Entity){return new ResourceLocation("porco_panda.png");}});

}

    public void generateNether(World world, Random random, int chunkX, int chunkZ){}
public void generateSurface(World world, Random random, int chunkX, int chunkZ){}
public int addFuel(ItemStack fuel){
	return 0;
}
@SideOnly(Side.CLIENT)
public void registerRenderers(){

}
public void serverLoad(FMLServerStartingEvent event){}
public void preInit(FMLPreInitializationEvent event){
	int entityID = EntityRegistry.findGlobalUniqueEntityId();
	mobid = entityID;
	EntityRegistry.registerGlobalEntityID(mcreator_panda.Entitypanda.class, "panda", entityID);
	EntityRegistry.registerModEntity(mcreator_panda.Entitypanda.class, "panda", entityID, instance, 64, 1, true);
	EntityList.entityEggs.put(Integer.valueOf(entityID), new EntityList.EntityEggInfo(entityID, (255 << 16) + (255 <<  + 255, (0 << 16) + (0 <<  + 0));
	EntityRegistry.addSpawn(mcreator_panda.Entitypanda.class, 20, 3, 30, EnumCreatureType.CREATURE ,mcreator_nwBiome.biome);

        
}

public static BiomeGenBase[] clean(final BiomeGenBase[] v) {
	List<BiomeGenBase> list = new ArrayList<BiomeGenBase>(Arrays.asList(v));
	list.removeAll(Collections.singleton(null));
	return list.toArray(new BiomeGenBase[list.size()]);
}

    /*public Entity spawnEntity(int var1, World var2, double var3, double var5, double var7)
    {
        if(var1==mobid)
                return new mcreator_panda.Entitypanda(var2);
        else
                return null;
    }*/


   public static class Entitypanda extends EntityCreature 
{
	World world = null;
    public Entitypanda(World var1)
    {
        super(var1);
        world = var1;
        experienceValue = 5;
        this.isImmuneToFire = false;
        addRandomArmor();
		setNoAI(!true);
        	
this.tasks.addTask(10, new EntityAIWander(this, 0.8D));
this.tasks.addTask(9, new EntityAILookIdle(this));
this.tasks.addTask(9, new EntityAISwimming(this));
this.tasks.addTask(3, new EntityAIEatGrass(this));
this.tasks.addTask(9, new EntityAITempt(this, 0.8D, Items.reeds, false));
    }

    

protected void applyEntityAttributes(){
super.applyEntityAttributes();
this.getEntityAttribute(SharedMonsterAttributes.movementSpeed).setBaseValue(0.25D);
this.getEntityAttribute(SharedMonsterAttributes.maxHealth).setBaseValue(10D);
if(this.getEntityAttribute(SharedMonsterAttributes.attackDamage)!=null)this.getEntityAttribute(SharedMonsterAttributes.attackDamage).setBaseValue(3D);
}


    

    
protected void addRandomArmor(){

}

protected void dropRareDrop(int par1){
this.dropItem(Items.reeds, 1);
}


	@Override
	protected Item getDropItem()
	{
		return new ItemStack(mcreator_pandaFoodCru.block).getItem();
	}

    @Override
    protected String getLivingSound()
    {
        return "mob.sheep.say";
    }

    @Override
    protected String getHurtSound()
    {
        return "game.neutral.hurt";
    }

	@Override
    protected String getDeathSound()
    {
        return "game.neutral.die";
    }

	@Override
    public void onStruckByLightning(EntityLightningBolt entityLightningBolt){
		super.onStruckByLightning(entityLightningBolt);
		int i = (int)this.posX;
		int j = (int)this.posY;
		int k = (int)this.posZ;
		Entity entity = this;

	}

	@Override
	public void fall(float l, float d){
		super.fall(l,d);
		int i = (int)this.posX;
		int j = (int)this.posY;
		int k = (int)this.posZ;
		super.fall(l,d);
		Entity entity = this;

	}

	@Override
	public void onDeath(DamageSource source){
		super.onDeath(source);
		int i = (int)this.posX;
		int j = (int)this.posY;
		int k = (int)this.posZ;
		Entity entity = this;


	}

	@Override
	public boolean interact(EntityPlayer entity){
		super.interact(entity);
		int i = (int)this.posX;
		int j = (int)this.posY;
		int k = (int)this.posZ;

		return true;
	}

	@Override
	protected float getSoundVolume()
	{
        return 1.0F;
	}

}



}

Server error is :

---- Minecraft Crash Report ----
// Sorry 
Time: 28/10/15 12:08
Description: Exception in server tick loop
net.minecraftforge.fml.common.LoaderException: java.lang.NoClassDefFoundError: net/minecraft/client/model/ModelPig
at net.minecraftforge.fml.common.LoadController.transition(LoadController.java:163)
at net.minecraftforge.fml.common.Loader.loadMods(Loader.java:538)
at net.minecraftforge.fml.server.FMLServerHandler.beginServerLoading(FMLServerHandler.java:87)
at net.minecraftforge.fml.common.FMLCommonHandler.onServerStart(FMLCommonHandler.java:355)
at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:117)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:438)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NoClassDefFoundError: net/minecraft/client/model/ModelPig
at mod.mcreator.NW.<init>(NW.java:131)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at java.lang.Class.newInstance(Unknown Source)
at net.minecraftforge.fml.common.ILanguageAdapter$JavaAdapter.getNewInstance(ILanguageAdapter.java:174)
at net.minecraftforge.fml.common.FMLModContainer.constructMod(FMLModContainer.java:511)
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.EventSubscriber.handleEvent(EventSubscriber.java:74)
at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322)
at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304)
at com.google.common.eventbus.EventBus.post(EventBus.java:275)
at net.minecraftforge.fml.common.LoadController.sendEventToModContainer(LoadController.java:212)
at net.minecraftforge.fml.common.LoadController.propogateStateMessage(LoadController.java:190)
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.EventSubscriber.handleEvent(EventSubscriber.java:74)
at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322)
at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304)
at com.google.common.eventbus.EventBus.post(EventBus.java:275)
at net.minecraftforge.fml.common.LoadController.distributeStateMessage(LoadController.java:119)
at net.minecraftforge.fml.common.Loader.loadMods(Loader.java:507)
... 5 more
Caused by: java.lang.ClassNotFoundException: net.minecraft.client.model.ModelPig
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 35 more
Caused by: java.lang.NullPointerException
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182)
... 37 more

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------
-- System Details --
Details:
Minecraft Version: 1.8
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.8.0_65, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 1053549224 bytes (1004 MB) / 1297612800 bytes (1237 MB) up to 2863661056 bytes (2731 MB)
JVM Flags: 2 total; -Xms1G -Xmx3G
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP v9.10 FML v8.0.99.99 Minecraft Forge 11.14.3.1521 4 mods loaded, 4 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
UC mcp{9.05} [Minecraft Coder Pack] (minecraft.jar) 
UC FML{8.0.99.99} [Forge Mod Loader] (forge-1.8-11.14.3.1521-universal.jar) 
UC Forge{11.14.3.1521} [Minecraft Forge] (forge-1.8-11.14.3.1521-universal.jar) 
UE NW{0.9.3} [NW] (new_world_i_pre_release_v_10.jar) 
Loaded coremods (and transformers): 
Profiler Position: N/A (disabled)
Is Modded: Definitely; Server brand changed to 'fml,forge'
Type: Dedicated Server (map_server.txt)

This code is not really the miens, I promised to a friend to solve it, but I do not find.

I know it use mcreator, I know that it is null, but that pleases him. Understand it.