package info.u_team.u_team_core;

import org.apache.logging.log4j.*;

import info.u_team.u_team_core.util.verify.JarSignVerifier;
import net.minecraftforge.fml.common.Mod;
import net.minecraftforge.fml.javafmlmod.FMLJavaModLoadingContext;

@Mod(UCoreMain.MODID)
public class UCoreMain {
	
	public static final String MODID = "uteamcore";
	public static final Logger LOGGER = LogManager.getLogger("UTeamCore");
	
	public UCoreMain() {
		JarSignVerifier.checkSigned(MODID);
		FMLJavaModLoadingContext.get().getModEventBus().register(this);
	}
}

package info.u_team.u_team_core;

import org.apache.logging.log4j.*;

import info.u_team.u_team_core.api.IModProxy;
import info.u_team.u_team_core.intern.proxy.*;
import info.u_team.u_team_core.util.verify.JarSignVerifier;
import net.minecraftforge.eventbus.api.SubscribeEvent;
import net.minecraftforge.fml.DistExecutor;
import net.minecraftforge.fml.common.Mod;
import net.minecraftforge.fml.event.lifecycle.*;
import net.minecraftforge.fml.javafmlmod.FMLJavaModLoadingContext;

@Mod(UCoreMain.MODID)
public class UCoreMain {
	
	public static final String MODID = "uteamcore";
	public static final Logger LOGGER = LogManager.getLogger("UTeamCore");
	
	private static final IModProxy PROXY = DistExecutor.safeRunForDist(() -> ClientProxy::new, () -> CommonProxy::new);
	
	public UCoreMain() {
		JarSignVerifier.checkSigned(MODID);
		FMLJavaModLoadingContext.get().getModEventBus().register(this);
		PROXY.construct();
	}
	
	@SubscribeEvent
	public void setup(FMLCommonSetupEvent event) {
		PROXY.setup();
	}
	
	@SubscribeEvent
	public void ready(FMLLoadCompleteEvent event) {
		PROXY.complete();
	}
	
}

--- 
+++ 
@@ -2,13 +2,8 @@
 
 import org.apache.logging.log4j.*;
 
-import info.u_team.u_team_core.api.IModProxy;
-import info.u_team.u_team_core.intern.proxy.*;
 import info.u_team.u_team_core.util.verify.JarSignVerifier;
-import net.minecraftforge.eventbus.api.SubscribeEvent;
-import net.minecraftforge.fml.DistExecutor;
 import net.minecraftforge.fml.common.Mod;
-import net.minecraftforge.fml.event.lifecycle.*;
 import net.minecraftforge.fml.javafmlmod.FMLJavaModLoadingContext;
 
 @Mod(UCoreMain.MODID)
@@ -17,22 +12,8 @@
 	public static final String MODID = "uteamcore";
 	public static final Logger LOGGER = LogManager.getLogger("UTeamCore");
 	
-	private static final IModProxy PROXY = DistExecutor.safeRunForDist(() -> ClientProxy::new, () -> CommonProxy::new);
-	
 	public UCoreMain() {
 		JarSignVerifier.checkSigned(MODID);
 		FMLJavaModLoadingContext.get().getModEventBus().register(this);
-		PROXY.construct();
 	}
-	
-	@SubscribeEvent
-	public void setup(FMLCommonSetupEvent event) {
-		PROXY.setup();
-	}
-	
-	@SubscribeEvent
-	public void ready(FMLLoadCompleteEvent event) {
-		PROXY.complete();
-	}
-	
 }
Remove proxy from main class