Solved Getting first item in GUI

Hi,

I've been working on this plugin for a while, but there's a problem. I try to get the first item in a gui by doing like this:

Code:

FileConfiguration config = YamlConfiguration.loadConfiguration(file);
                    ItemStack slot1 = e.getInventory().getItem(0);
                    if(slot1 !=null && slot1.getType() != Material.AIR)  {
                        config.set(p.getName() + "1", slot1);
                    } else {
                        config.set(p.getName(), "AIR");
                    }
                    p.closeInventory();

But that doesn't work. It doesn't put it in the file I want. There are no errors.
Be free to comment && help!

 

@Thrylouis
You never saved the config after setting.

 

OMG: I'm so dumb. Thanks!