Can't find why program crash

[Kristopher_RAS]

Hi, I've recently started to create mods with Forge Mod Builder with this tutorial:

 

this is my code : 

 

Main.java : 

package carl.mod;

import carl.mod.Reference;
import carl.mod.proxy.CommonProxy;
import net.minecraftforge.fml.common.Mod;
import net.minecraftforge.fml.common.Mod.EventHandler;
import net.minecraftforge.fml.common.Mod.Instance;
import net.minecraftforge.fml.common.SidedProxy;
import net.minecraftforge.fml.common.event.FMLInitializationEvent;
import net.minecraftforge.fml.common.event.FMLPostInitializationEvent;
import net.minecraftforge.fml.common.event.FMLPreInitializationEvent;

@Mod(modid = Reference.MODID, name = Reference.NAME, version = Reference.VERSION)
public class Main 
{
	
	@Instance
	public static Main instance;
	
	@SidedProxy(clientSide = Reference.CLIENT, serverSide = Reference.COMMON)
	public static CommonProxy proxy;
	
	
	@EventHandler
	public static void preInit(FMLPreInitializationEvent event) {}
	
	@EventHandler
	public static void init(FMLInitializationEvent event) {}
	
	
	@EventHandler
	public static void postInit(FMLPostInitializationEvent event) {}
	
}

 

and the Reference.java where I store all my info :

 

package carl.mod;

public class Reference {
	public static final String MODID = "modtest";
	public static final String NAME = "Mod Test";
	public static final String VERSION = "0.0.1";
	
	public static final String CLIENT = "proxy.ClientProxy";
	public static final String COMMON = "proxy.CommonProxy";
}

 

I did exactly like him but when I launch Minecraft it crashes. 

Edited March 3, 2018 by Kristopher_RAS
I solved the first part of my question

[Kristopher_RAS]

I have resolved it just come from those two lines:

	public static final String CLIENT = "carl.mod.proxy.ClientProxy";
	public static final String COMMON = "carl.mod.proxy.CommonProxy";