I'm not sure what I need to do to my mod to make it work on a server can eny one help?

On Minecraft 1.3+ you need as much as you need to make a client mod work.

 

Mods are no longer client / server, they are distributed in universal packages, so the same code works both on clients and servers (because the client, internally, is a server too);

You need a client and a common proxy.

example:

 

 

package archangel.client;

 

import net.minecraftforge.client.MinecraftForgeClient;

import archangel.emeraldtools.CommonProxy;

 

public class ClientProxy extends CommonProxy {

 

@Override

public void registerRenderers() {

MinecraftForgeClient.preloadTexture(ITEMS_PNG);

}

 

}

 

 

 

 

 

package archangel.emeraldtools;

 

public class CommonProxy {

    public void initRenderingAndTextures() {}

   

public static String ITEMS_PNG = "/EmeraldTools.png";

 

// Client stuff

public void registerRenderers() {

// Nothing here as this is the server side proxy

}

}

 

 

 

Also follow this http://www.minecraftforge.net/wiki/Tutorials/Making_the_base_mod_file and most importantly this http://www.minecraftforge.net/wiki/Tutorials/Upgrading_To_Forge_for_1.3.1#The_proxy_system

Aaaa so that's what I was missing the server proxy