Need help with InventoryGUI

Hello!
I am coding a plugin so when u right click at a stone, a inventory gui will opened with mushroom stews. But my code isn't working and i got errors
Pls help if you can do my code work
Code:

Code:java

package me.kitgui;
 
import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.Material;
import org.bukkit.block.Block;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.block.Action;
import org.bukkit.event.inventory.InventoryClickEvent;
import org.bukkit.event.player.PlayerInteractEvent;
import org.bukkit.event.player.PlayerJoinEvent;
import org.bukkit.inventory.Inventory;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.meta.ItemMeta;
import org.bukkit.plugin.java.JavaPlugin;
 
public class Main extends JavaPlugin implements Listener {
 
 
    public void onEnable() {
        getServer().getPluginManager().registerEvents(this, this);
    }
 
    private void openGUI(Player player) {
        Inventory inv = Bukkit.createInventory(null, 9, ChatColor.GOLD
                + "Free soup");
 
 
        ItemStack soup = new ItemStack(Material.MUSHROOM_SOUP);
        ItemMeta soupMeta = soup.getItemMeta();
 
        soupMeta.setDisplayName("");
        soup.setItemMeta(soupMeta);
 
        inv.setItem(0, soup);
        inv.setItem(1, soup);
        inv.setItem(2, soup);
        inv.setItem(3, soup);
        inv.setItem(4, soup);
        inv.setItem(5, soup);
        inv.setItem(6, soup);
        inv.setItem(7, soup);
        inv.setItem(8, soup);
        inv.setItem(9, soup);
 
    player.openInventory(inv);
 
    }
 
 
 
 
 
    @EventHandler
    public void onInventoryClick(InventoryClickEvent e) {
        if (!ChatColor.stripColor(e.getInventory().getName())
                .equalsIgnoreCase("Free soup"))
                return;
 
        Player player = (Player) e.getWhoClicked();
        e.setCancelled(true);
 
        if(e.getCurrentItem()==null
                || e.getCurrentItem().getType()==Material.AIR
                ||!e.getCurrentItem().hasItemMeta()) {
            player.closeInventory();
            return;
        }
 
        switch(e.getCurrentItem().getType()) {
        case MUSHROOM_SOUP:
        player.closeInventory();
        break;   
        default:
            player.closeInventory();
            break;
        }
        }
 
 
        @EventHandler
        public void onPlayerInteract(PlayerInteractEvent e) {
            Action a = e.getAction();
                Block block = e.getClickedBlock();
                if(a == Action.LEFT_CLICK_BLOCK) {
                    if(block.getType() == Material.STONE);
                    openGUI(e.getPlayer());
                }
        }
}
 
 
 

 

Stackore Can you post the stacktrace?

 

Here is my errors by the way: