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I'm trying to do a simple chest just to understand how this work, and try make a backpack, but i'm trying to use a tutorials, but I'm stuck, my code is returning the getPos in color red, like a error, and Idk what to do, I'm so lost. code are unfinished. can please someone help-me? thanks <3
the error is here public boolean isUseableByPlayer

package me.network.archadia.tileentites;

import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.inventory.IInventory;
import net.minecraft.item.ItemStack;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.util.ChatComponentText;
import net.minecraft.util.ChatComponentTranslation;
import net.minecraft.util.IChatComponent;
import net.minecraft.world.*;
public class TileEntityContainer extends TileEntity implements IInventory {

    private ItemStack[] inventory;
    private String customName;

    public TileEntityContainer() {
    this.inventory = new ItemStack[this.getSizeInventory()];
    }

    @Override
    public int getSizeInventory() {
        return 23;
    }

    @Override
    public ItemStack getStackInSlot(int index) {
        if(index < 0 || index >= this.getSizeInventory()){
            return null;
        }
        return this.inventory[index];
    }

    @Override
    public ItemStack decrStackSize(int index, int count) {
        if (this.getStackInSlot(index) != null) {
            ItemStack itemstack;

            if (this.getStackInSlot(index).stackSize <= count) {
                itemstack = this.getStackInSlot(index);
                this.setInventorySlotContents(index, null);
                this.markDirty();
                return itemstack;

            } else {
                itemstack = this.getStackInSlot(index).splitStack(count);
                if (this.getStackInSlot(index).stackSize <= 0) {
                    this.setInventorySlotContents(index, null);
                } else {
                    this.setInventorySlotContents(index, this.getStackInSlot(index));
                }
                this.markDirty();
                return itemstack;
            }
        } else {
            return null;
        }
    }

    @Override
    public ItemStack getStackInSlotOnClosing(int p_70304_1_) {
        return null;
    }

    @Override
    public void setInventorySlotContents(int index, ItemStack stack)
    {
if(index < 0 || index >= this.getSizeInventory())
{
    return;
}
if (stack != null && stack.stackSize > this.getInventoryStackLimit())
{
    stack.stackSize = this.getInventoryStackLimit();
}
if(stack != null && stack.stackSize == 0)
{
    stack = null;
}
    this.inventory[index] = stack;
this.markDirty();
    }

    @Override
    public String getInventoryName() {
        return this.hasCustomInventoryName() ? this.customName : "container.tile_entity_container";
    }

    @Override
    public boolean hasCustomInventoryName() {
        return this.customName != null && !this.customName.equals("");
    }
    public IChatComponent getDisplayName()
    {
        return this.hasCustomInventoryName() ? new ChatComponentText(this.getInventoryName()) : new ChatComponentTranslation(this.getInventoryName());
    }
    @Override
    public int getInventoryStackLimit() {
        return 64;
    }

    @Override
    public boolean isUseableByPlayer(EntityPlayer player) {
//Getting the error here, in red>>>>>>>>>>>VVVVVVV                   and this is red too>>>VVV
    return this.worldObj.getTileEntity(this.getPos()) == this && player.getDistanceSq(this.pos.add(0.5, 0.5, 0.5)) <= 64; 
    }

    @Override
    public void openInventory() {

    }

    @Override
    public void closeInventory() {

    }

    @Override
    public boolean isItemValidForSlot(int index, ItemStack stack) {
        return true;
    }
    public void clear()
    {
        for(int i =0; i < this.getInventoryStackLimit(); i++)
        {
            this.setInventorySlotContents(i, null);
        }
    }
}