I can't damage items?

I am trying to damage items upon right click but it's not working... Here is the code and the gradle log:

Code:

package mod.mcreator;

import net.minecraftforge.fml.relauncher.Side;
import net.minecraftforge.fml.common.registry.GameRegistry;
import net.minecraftforge.fml.common.event.FMLServerStartingEvent;
import net.minecraftforge.fml.common.event.FMLPreInitializationEvent;
import net.minecraftforge.fml.common.event.FMLInitializationEvent;
import net.minecraftforge.fml.common.FMLCommonHandler;
import net.minecraftforge.common.util.EnumHelper;

import net.minecraft.world.World;
import net.minecraft.util.EnumParticleTypes;
import net.minecraft.util.EnumHand;
import net.minecraft.util.ActionResult;
import net.minecraft.server.MinecraftServer;
import net.minecraft.item.ItemSword;
import net.minecraft.item.ItemStack;
import net.minecraft.item.Item;
import net.minecraft.init.Blocks;
import net.minecraft.entity.player.EntityPlayerMP;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.entity.effect.EntityLightningBolt;
import net.minecraft.client.renderer.block.model.ModelResourceLocation;
import net.minecraft.client.Minecraft;

import java.util.Set;
import java.util.Random;
import java.util.HashMap;

public class mcreator_voidSword {

public mcreator_voidSword() {
}

public static Item block;
public static Object instance;

public void load(FMLInitializationEvent event) {
ItemStack stack = new ItemStack(block, 1);
if (event.getSide() == Side.CLIENT)
Minecraft.getMinecraft().getRenderItem().getItemModelMesher()
.register(block, 0, new ModelResourceLocation("testenvironmentmod:voidsword", "inventory"));

GameRegistry.addRecipe(stack,
new Object[]{"012", "345", "678", Character.valueOf('0'), mcreator_netherStarBlock.block, Character.valueOf('1'),
mcreator_voidBlock.block, Character.valueOf('2'), mcreator_netherStarBlock.block, Character.valueOf('3'),
mcreator_netherStarBlock.block, Character.valueOf('4'), mcreator_voidBlock.block, Character.valueOf('5'),
mcreator_netherStarBlock.block, Character.valueOf('6'), mcreator_netherStarBlock.block, Character.valueOf('7'),
Blocks.OBSIDIAN, Character.valueOf('8'), mcreator_netherStarBlock.block,});
}

public void generateNether(World world, Random random, int chunkX, int chunkZ) {
}

public void generateSurface(World world, Random random, int chunkX, int chunkZ) {
}

public int addFuel(ItemStack fuel) {
return 0;
}

public void serverLoad(FMLServerStartingEvent event) {
}

public void preInit(FMLPreInitializationEvent event) {
}

public void registerRenderers() {
}

static {
Item.ToolMaterial enumt = EnumHelper.addToolMaterial("VOIDSWORD", 1, 1000, 4F, 20, 2);
block = (Item) (new ItemSword(enumt) {
public Set<String> getToolClasses(ItemStack stack) {
HashMap<String, Integer> ret = new HashMap<String, Integer>();
ret.put("sword", 1);
return ret.keySet();
}

@Override
public ActionResult<ItemStack> onItemRightClick(World world, EntityPlayer entity, EnumHand hand) {
float var4 = 1.0F;
ActionResult<ItemStack> ar = super.onItemRightClick(world, entity, hand);
int i = (int) (entity.prevPosX + (entity.posX - entity.prevPosX) * (double) var4);
int j = (int) (entity.prevPosY + (entity.posY - entity.prevPosY) * (double) var4 + 1.62D);
int k = (int) (entity.prevPosZ + (entity.posZ - entity.prevPosZ) * (double) var4);

if (true) {
if (entity instanceof EntityPlayerMP) {
MinecraftServer minecraftserver = FMLCommonHandler.instance().getMinecraftServerInstance();
if (minecraftserver != null)
minecraftserver.getCommandManager().executeCommand((EntityPlayerMP) entity, "gamerule sendCommandFeedback false");
}
}

if (true) {
if (entity instanceof EntityPlayerMP) {
MinecraftServer minecraftserver = FMLCommonHandler.instance().getMinecraftServerInstance();
if (minecraftserver != null)
minecraftserver.getCommandManager().executeCommand((EntityPlayerMP) entity, "scoreboard players tag @a add Safe");
}
}

if (true) {
if (entity instanceof EntityPlayerMP) {
MinecraftServer minecraftserver = FMLCommonHandler.instance().getMinecraftServerInstance();
if (minecraftserver != null)
minecraftserver.getCommandManager().executeCommand((EntityPlayerMP) entity,
"scoreboard players tag @e[type=item] add Safe");
}
}

if (true) {
if (entity instanceof EntityPlayerMP) {
MinecraftServer minecraftserver = FMLCommonHandler.instance().getMinecraftServerInstance();
if (minecraftserver != null)
minecraftserver.getCommandManager().executeCommand((EntityPlayerMP) entity, "kill @e[tag=!Safe,r=10]");
}
}

if (true) {
world.spawnParticle(EnumParticleTypes.PORTAL, (double) i, (double) 1, (double) k, 2.0D, 2.0D, 2.0D);
}

if (true) {
itemstack.damageItem(1, entity);
}

return ar;
}

@Override
public void onCreated(ItemStack itemstack, World world, EntityPlayer entity) {
super.onCreated(itemstack, world, entity);
float var4 = 1.0F;
int i = (int) (entity.prevPosX + (entity.posX - entity.prevPosX) * (double) var4);
int j = (int) (entity.prevPosY + (entity.posY - entity.prevPosY) * (double) var4 + 1.62D);
int k = (int) (entity.prevPosZ + (entity.posZ - entity.prevPosZ) * (double) var4);

if (true) {
world.spawnEntity(new EntityLightningBolt(world, i, j, k, false));
}

}
}).setUnlocalizedName("VoidSword");
block.setRegistryName("VoidSword");
GameRegistry.register(block);
block.setCreativeTab(mcreator_voidTab.tab);

}

}

Gradle log:

warning: [options] bootstrap class path not set in conjunction with -source 1.6
C:\Pylo\MCreator175\forge\build\sources\main\java\mod\mcreator\mcreator_voidSword.java:126: error: cannot find symbol
itemstack.damageItem(1, entity);
^
symbol: variable itemstack
C:\Pylo\MCreator175\forge\build\sources\main\java\mod\mcreator\mcreator_voidPickaxe.java:107: error: cannot find symbol
itemstack.damageItem(1, entity);
^
symbol: variable itemstack
C:\Pylo\MCreator175\forge\build\sources\main\java\mod\mcreator\mcreator_voidBreaker.java:89: error: cannot find symbol
itemstack.damageItem(1, entity);
^
symbol: variable itemstack
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
3 errors
1 warning

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.

There are other tools I am trying to damage too as you can see but they all have the same problem...