Solved inventory.setItem() Showing Errors in Eclipse

Hey all, I have a problem when i try to use setitem() on my gui/inventory here is my code:

Code:

import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.Material;
import org.bukkit.inventory.Inventory;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.meta.ItemMeta;


public class MainGui {
     public static Inventory MainGui = Bukkit.createInventory(null, 18,
            ChatColor.DARK_RED + "Ban" + ChatColor.AQUA + "Gui");

    ItemStack spawnItem = nameItem(new ItemStack(Material.COMPASS), ChatColor.GOLD + "Teleport To Spawn!");

    MainGui.setItem(4, spawnItem)

    private ItemStack nameItem(ItemStack item, String name) {
        ItemMeta meta = item.getItemMeta();
        meta.setDisplayName(name);
        item.setItemMeta(meta);
        return item;
    }
}

The Problem is that MainGui.setItem() shows up red in eclipse:



-EDIT-

I found the problem, i forgot to make the MainGui.setItem() Static

 

@fireboyev Any reason for the static? And you can't run methods not in a method. Little Java knowledge will help you in Bukkit.