Bat needs to drop chicken. Many errors, I'm new to Java.

I am trying to make bats drop chicken. The code I am using doesn't seem to be working. I am new to Java, so details are appreciated. If you are able of fixing the issue, please send new code and explain what I did wrong. THANKS!

I have tried many variations of this. If this method doesn't work, I would like to request some newly written code. 

package net.mcreator.trevcorp_meat_paste;

import net.minecraftforge.fml.relauncher.SideOnly;
import net.minecraftforge.fml.relauncher.Side;
import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;
import net.minecraftforge.fml.common.eventhandler.EventPriority;
import net.minecraftforge.fml.common.event.FMLInitializationEvent;
import net.minecraftforge.common.MinecraftForge;
import net.minecraftforge.client.event.RenderGameOverlayEvent;
import net.minecraftforge.event.entity.living.LivingDropsEvent;

import net.minecraft.world.World;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.client.Minecraft;
import net.minecraft.entity.passive.EntityBat;
import net.minecraft.entity.item.EntityItem;
import net.minecraft.init.Items;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;

   import net.minecraft.block.Block;
   import net.minecraft.block.material.Material;
   import net.minecraft.creativetab.CreativeTabs;
   import net.minecraft.entity.boss.EntityWither;
   import net.minecraft.entity.item.EntityItem;
   import net.minecraft.init.Items;
   import net.minecraft.item.Item;
   import net.minecraft.item.ItemStack;
   import net.minecraftforge.common.util.EnumHelper;
   import net.minecraftforge.event.entity.living.LivingDropsEvent;

public class MCreatorBatMeat{

public static class RenderGameOverlayEvent{

@SubscribeEvent(priority=EventPriority.NORMAL, receiveCanceled=true)
public void onEvent(LivingDropsEvent event)
{
    if (event.entity instanceof EntityBat)
    {
        // DEBUG
        System.out.println("EntityBat drops event");
        event.drops.clear();
    }
} 

@SubscribeEvent(priority=EventPriority.NORMAL, receiveCanceled=true)
public void onEvent(LivingDropsEvent event)
{
    if (event.entity instanceof EntityBat)
    {
        // DEBUG
        System.out.println("EntityBat drops event");
        event.drops.clear();
        ItemStack itemStackToDrop = new ItemStack(Items.CHICKEN, 2);
        event.drops.add(new EntityItem(event.entity.worldObj, event.entity.posX, 
              event.entity.posY, event.entity.posZ, itemStackToDrop));
    }
} 

}

}

The console shows this when I run it:

Executing gradle command: runClient Build info: MCreator 1.9.1, 64-bit, 16227 MB, Windows 10 - cmd, JVM 1.8.0_222, JAVA_HOME: C:\Program Files\Pylo\MCreator\jdk C:\Users\USER\MCreatorWorkspaces\trevcorp_meat_paste>gradlew -Dorg.gradle.java.home="C:/Program Files/Pylo/MCreator/jdk" -Dorg.gradle.parallel=false -Dorg.gradle.jvmargs="-Xms625m -Xmx2048m" runClient  This mapping 'snapshot_20171003' was designed for MC 1.12! Use at your own peril. :deobfCompileDummyTask :deobfProvidedDummyTask :sourceApiJava UP-TO-DATE :compileApiJava NO-SOURCE :processApiResources NO-SOURCE :apiClasses UP-TO-DATE :sourceMainJava UP-TO-DATE C:\Users\USER\MCreatorWorkspaces\trevcorp_meat_paste\build\sources\main\java\net\mcreator\trevcorp_meat_paste\MCreatorBatMeat.java:25: error: method onEvent(LivingDropsEvent) is already defined in class RenderGameOverlayEvent        public void onEvent(LivingDropsEvent event) {                   ^ C:\Users\USER\MCreatorWorkspaces\trevcorp_meat_paste\build\sources\main\java\net\mcreator\trevcorp_meat_paste\MCreatorBatMeat.java:17: error: entity has private access in EntityEvent           if (event.entity instanceof EntityBat) {                   ^ C:\Users\USER\MCreatorWorkspaces\trevcorp_meat_paste\build\sources\main\java\net\mcreator\trevcorp_meat_paste\MCreatorBatMeat.java:20: error: drops has private access in LivingDropsEvent              event.drops.clear();                  ^ C:\Users\USER\MCreatorWorkspaces\trevcorp_meat_paste\build\sources\main\java\net\mcreator\trevcorp_meat_paste\MCreatorBatMeat.java:26: error: entity has private access in EntityEvent           if (event.entity instanceof EntityBat) {                   ^ C:\Users\USER\MCreatorWorkspaces\trevcorp_meat_paste\build\sources\main\java\net\mcreator\trevcorp_meat_paste\MCreatorBatMeat.java:29: error: drops has private access in LivingDropsEvent              event.drops.clear();                  ^ C:\Users\USER\MCreatorWorkspaces\trevcorp_meat_paste\build\sources\main\java\net\mcreator\trevcorp_meat_paste\MCreatorBatMeat.java:31: error: entity has private access in EntityEvent              event.drops.add(new EntityItem(event.entity.worldObj, event.entity.posX, event.entity.posY, event.entity.posZ, itemStackToDrop));                                                 ^ C:\Users\USER\MCreatorWorkspaces\trevcorp_meat_paste\build\sources\main\java\net\mcreator\trevcorp_meat_paste\MCreatorBatMeat.java:31: error: cannot find symbol              event.drops.add(new EntityItem(event.entity.worldObj, event.entity.posX, event.entity.posY, event.entity.posZ, itemStackToDrop));                                                        ^   symbol:   variable worldObj   location: variable entity of type Entity C:\Users\USER\MCreatorWorkspaces\trevcorp_meat_paste\build\sources\main\java\net\mcreator\trevcorp_meat_paste\MCreatorBatMeat.java:31: error: entity has private access in EntityEvent              event.drops.add(new EntityItem(event.entity.worldObj, event.entity.posX, event.entity.posY, event.entity.posZ, itemStackToDrop));                                                                        ^ C:\Users\USER\MCreatorWorkspaces\trevcorp_meat_paste\build\sources\main\java\net\mcreator\trevcorp_meat_paste\MCreatorBatMeat.java:31: error: entity has private access in EntityEvent              event.drops.add(new EntityItem(event.entity.worldObj, event.entity.posX, event.entity.posY, event.entity.posZ, itemStackToDrop));                                                                                           ^ C:\Users\USER\MCreatorWorkspaces\trevcorp_meat_paste\build\sources\main\java\net\mcreator\trevcorp_meat_paste\MCreatorBatMeat.java:31: error: entity has private access in EntityEvent              event.drops.add(new EntityItem(event.entity.worldObj, event.entity.posX, event.entity.posY, event.entity.posZ, itemStackToDrop));                                                                                                              ^ C:\Users\USER\MCreatorWorkspaces\trevcorp_meat_paste\build\sources\main\java\net\mcreator\trevcorp_meat_paste\MCreatorBatMeat.java:31: error: drops has private access in LivingDropsEvent              event.drops.add(new EntityItem(event.entity.worldObj, event.entity.posX, event.entity.posY, event.entity.posZ, itemStackToDrop));                  ^ 11 errors :compileJava FAILED FAILURE: Build failed with an exception. * What went wrong: Execution failed for task ':compileJava'. > Compilation failed; see the compiler error output for details. * Try: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights. * Get more help at https://help.gradle.org BUILD FAILED in 6s 5 actionable tasks: 3 executed, 2 up-to-date C:\Users\USER\MCreatorWorkspaces\trevcorp_meat_paste> Task completed with return code 0 in 8492 milliseconds