Config refuses to save

I dont understand, it works perfectly fine when creating the config, and getting from the config. But it wont save, and I'm pretty sure its setting but not saving...

Code:

package potentiamc.org;


import java.io.File;
import java.io.IOException;
import java.util.Arrays;
import java.util.List;

import org.bukkit.configuration.file.FileConfiguration;
import org.bukkit.configuration.file.YamlConfiguration;
import org.bukkit.entity.Player;

public class PlayerConfig {


    Core core;
  
    public File userdata;
    public File f;
    public FileConfiguration playerData;
  
    public PlayerConfig(Core instance){
        this.core = instance;
        this.userdata = new File(core.getDataFolder(), File.separator + "data");
      
    }

    public void create(Player p) {
        //When the player file is created for the first time...
         if (!f.exists()) {

             try {
                                
                 playerData = YamlConfiguration.loadConfiguration(f);

                 List<String> pAbilities = Arrays.asList("DIAMOND_AXE","STICK");
                
                 playerData.createSection("kits");
                
                 playerData.set("kits.size.kit1.name", "KIT_ONE");
                 playerData.set("kits.size.kit1.playstyle", "souper");
                
                 playerData.set("kits.size.kit2.name", "KIT_TWO");
                 playerData.set("kits.size.kit2.playstyle", "souper");
                
                 playerData.set("kits.size.kit3.name", "KIT_THREE");
                 playerData.set("kits.size.kit3.playstyle", "souper");
                
                 playerData.set("kits.current", "kit1");
                
                

                
                 playerData.createSection("stats");
                 playerData.set("stats.wins", 0);
                 playerData.set("stats.loses", 0);
                 playerData.set("stats.elo", 0);
                 playerData.set("stats.balance", 0);
                 playerData.set("stats.elorank", "Peasant");

                 playerData.createSection("abilities");
                 playerData.set("abilities.zeus.material", "DIAMOND_AXE");
                 playerData.set("abilities.shockwave.material", "STICK");
                 playerData.set("abilities.material", pAbilities);

                 playerData.createSection("playstyle");
                 playerData.set("playstyle.souper", false);
                 playerData.set("playstyle.survivalist", false);
                 playerData.set("playstyle.hearts", 40);
                 playerData.set("playstyle.soups", 12);
                
                 playerData.createSection("enhancers");
                 playerData.set("enhancers.survivalist", 0);
                 playerData.set("enhancers.soups", 0);

                 playerData.save(getfile(p));
                
             } catch (IOException exception) {

                 exception.printStackTrace();
             }
         }
         }
      

    public File getfolder() {
        return userdata;
    }
    public File getfile(Player p) {
        f = new File(userdata,p.getUniqueId().toString() + ".yml");
        return f;
    }
    public void load(Player player) {
        playerData = YamlConfiguration.loadConfiguration(getfile(player));
    }
    public FileConfiguration get(Player player) {
        playerData = YamlConfiguration.loadConfiguration(getfile(player));
        return playerData;
      
    }
  
  
    public void save(FileConfiguration ymlConfig, File ymlFile) {
        try {
        ymlConfig.save(ymlFile);

         } catch (IOException exception) {

             exception.printStackTrace();
         }
        
    }
        
  
    public FileConfiguration getplayerData(File file) {
        return playerData = YamlConfiguration.loadConfiguration(file);
      
    }


}

 

Your problems:
- The variable 'f' is never, therefore it is null
- (May be a problem once the file is already created) You're only defining the variable 'playerData' if the file does not exist.