I know this is probably a stupid question, but I've been trying to get my entity to render, so I used this code in my load():

EntityRegistry.registerModEntity(EntityZombieSpawner.class, "Zombie Spawner", 500, instance, 64, 10, true);
RenderingRegistry.registerEntityRenderingHandler(EntityZombieSpawner.class, new  RenderSnowball(zombiespawner.getIconFromDamage(0)));

 

When I put my entity into the world, I get this error:

 

2013-01-24 19:15:48 [sEVERE] [ForgeModLoader] A severe problem occurred during the spawning of an entity
java.lang.NoSuchMethodException: pie.mods.BetterDungeons.EntityZombieSpawner.<init>(net.minecraft.world.World)
at java.lang.Class.getConstructor0(Unknown Source)
at java.lang.Class.getConstructor(Unknown Source)
at cpw.mods.fml.client.FMLClientHandler.spawnEntityIntoClientWorld(FMLClientHandler.java:341)
at cpw.mods.fml.common.FMLCommonHandler.spawnEntityIntoClientWorld(FMLCommonHandler.java:334)
at cpw.mods.fml.common.network.EntitySpawnPacket.execute(EntitySpawnPacket.java:183)
at cpw.mods.fml.common.network.FMLNetworkHandler.handleFMLPacket(FMLNetworkHandler.java:102)
at cpw.mods.fml.common.network.FMLNetworkHandler.handlePacket250Packet(FMLNetworkHandler.java:67)
at net.minecraft.client.multiplayer.NetClientHandler.handleCustomPayload(NetClientHandler.java:1483)
at net.minecraft.network.packet.Packet250CustomPayload.processPacket(Packet250CustomPayload.java:70)
at net.minecraft.network.MemoryConnection.processReadPackets(MemoryConnection.java:80)
at net.minecraft.client.multiplayer.NetClientHandler.processReadPackets(NetClientHandler.java:240)
at net.minecraft.client.multiplayer.WorldClient.tick(WorldClient.java:92)
at net.minecraft.client.Minecraft.runTick(Minecraft.java:1872)
at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:846)
at net.minecraft.client.Minecraft.run(Minecraft.java:771)
at java.lang.Thread.run(Unknown Source)

 

My EntityZombieSpawner.java:

package pie.mods.BetterDungeons;
import net.minecraft.entity.EntityLiving;
import net.minecraft.util.DamageSource;
import net.minecraft.util.MovingObjectPosition;
import net.minecraft.world.World;
import net.minecraft.entity.monster.EntityZombie;
import net.minecraft.entity.projectile.EntityThrowable;

public class EntityZombieSpawner extends EntityThrowable {
public EntityZombieSpawner(World world, EntityLiving entity)
    {
        super(world, entity);
    }
protected void onImpact(MovingObjectPosition objposition)
    {

	EntityZombie zombie = new EntityZombie(this.worldObj);
	zombie.setPositionAndRotation(objposition.blockX, objposition.blockY+1, objposition.blockZ, 0.0F, 0.0F);
	this.worldObj.spawnEntityInWorld(zombie);
        this.worldObj.spawnParticle("snowballpoof", this.posX, this.posY, this.posZ, 0.0D, 0.0D, 0.0D);
        this.setDead();
        
    }
}

 

Any help is appreciated!

You need a constructor with this signature:

 

 

EntityZombieSpawner(World world)

 

I think what happens is that the server sends a packet to the client telling it to spawn its own local copy of the entity, and the client tries to instantiate it by calling the above constructor. The client doesn't need to know about the throwing entity, so it should be all right to leave it null in that case, i.e.

   public EntityZombieSpawner(World world) {
      super(world);
   }

Thanks, this fixed the problem