NullPointerException on recipes load

I'm making plugin which adds stone generators, but I have a problem with custom recipes. I can craft only coal tier generator and other not works. Could you help me?

Here's some info:

logs:

Code:

java.lang.NullPointerException: null
    at org.bukkit.inventory.ShapedRecipe.getShape(ShapedRecipe.java:194) ~[patched_1.15.2.jar:git-Paper-121]
    at org.bukkit.craftbukkit.v1_15_R1.inventory.CraftShapedRecipe.fromBukkitRecipe(CraftShapedRecipe.java:33) ~[patched_1.15.2.jar:git-Paper-121]
    at org.bukkit.craftbukkit.v1_15_R1.CraftServer.addRecipe(CraftServer.java:1143) ~[patched_1.15.2.jar:git-Paper-121]
    at me.rudykot.stonegen.StoneGenPlugin.loadRecipes(StoneGenPlugin.java:95) ~[?:?]
    at me.rudykot.stonegen.StoneGenPlugin.onEnable(StoneGenPlugin.java:45) ~[?:?]
    at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:263) ~[patched_1.15.2.jar:git-Paper-121]
    at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:337) ~[patched_1.15.2.jar:git-Paper-121]
    at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:435) ~[patched_1.15.2.jar:git-Paper-121]
    at org.bukkit.craftbukkit.v1_15_R1.CraftServer.enablePlugin(CraftServer.java:470) ~[patched_1.15.2.jar:git-Paper-121]
    at org.bukkit.craftbukkit.v1_15_R1.CraftServer.enablePlugins(CraftServer.java:384) ~[patched_1.15.2.jar:git-Paper-121]
    at net.minecraft.server.v1_15_R1.MinecraftServer.a(MinecraftServer.java:482) ~[patched_1.15.2.jar:git-Paper-121]
    at net.minecraft.server.v1_15_R1.DedicatedServer.init(DedicatedServer.java:298) ~[patched_1.15.2.jar:git-Paper-121]
    at net.minecraft.server.v1_15_R1.MinecraftServer.run(MinecraftServer.java:885) ~[patched_1.15.2.jar:git-Paper-121]
    at java.lang.Thread.run(Thread.java:830) [?:?]

Plugin main:

Code:

/*
*
* This source code is under CC BY-NC-SA 4.0 license
*
* you can check license details at:
*
* https://creativecommons.org/licenses/by-nc-sa/4.0/
*
*/


package me.rudykot.stonegen;

import java.util.Map;

import org.bukkit.Material;
import org.bukkit.NamespacedKey;
import org.bukkit.configuration.file.FileConfiguration;
import org.bukkit.enchantments.Enchantment;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.ShapedRecipe;
import org.bukkit.inventory.meta.ItemMeta;
import org.bukkit.plugin.java.JavaPlugin;
import me.rudykot.stonegen.random.RandomChooser;

public class StoneGenPlugin extends JavaPlugin{
   
    public static FileConfiguration config;
   
    public static ItemStack coalGen, lapisGen, diamondGen;
   
    public static Map<Material,RandomChooser<ItemStack>> choosers;
    @Override
    public void onEnable() {
        saveDefaultConfig();
        config =getConfig();
       
        coalGen = getConfigItem(Material.COAL_ORE,"generators.items");
        lapisGen = getConfigItem(Material.LAPIS_ORE,"generators.items");
        diamondGen = getConfigItem(Material.DIAMOND_ORE,"generators.items");
       
        loadRecipes();
       
        getServer().getPluginManager().registerEvents(new EventListener(), this);
       
    }
   
    @Override
    public void onDisable() {
        // TODO Auto-generated method stub
        super.onDisable();
    }
   
    public static ItemStack getConfigItem(Material m,String path) {
        String realpath=path+'.'+m.toString();
        ItemStack i=new ItemStack(m);
        ItemMeta im=i.getItemMeta();
       
        im.setDisplayName(config.getString(realpath+".name"));
        im.setLore(config.getStringList(realpath+".lore"));
       
        if(config.getBoolean(realpath+".enchanted")) {
            i.addEnchantment(Enchantment.DURABILITY, 1);
        }
       
        i.setItemMeta(im);
        return i;
    }
   

    public void loadRecipes() {
        NamespacedKey coalkey = new NamespacedKey(this, "generator_I");
       
        ShapedRecipe IGen = new ShapedRecipe(coalkey,coalGen);
        IGen.shape("rir", "iSi", "rPr");
        IGen.setIngredient('S', Material.STONE);
        IGen.setIngredient('i', Material.IRON_INGOT);
        IGen.setIngredient('r', Material.REDSTONE);
        IGen.setIngredient('P', Material.PISTON);

       
        getServer().addRecipe(IGen);  // This is working ^^^
       
        NamespacedKey lapiskey = new NamespacedKey(this, "generator_II");
       
        ShapedRecipe IIGen = new ShapedRecipe(lapiskey,lapisGen);
        IGen.shape("RGR", "GIG", "RPR");
        IGen.setIngredient('G', Material.COAL_ORE);
        IGen.setIngredient('I', Material.IRON_BLOCK);
        IGen.setIngredient('R', Material.REDSTONE_BLOCK);
        IGen.setIngredient('P', Material.PISTON);

       
        getServer().addRecipe(IIGen);
       
        NamespacedKey diamondkey = new NamespacedKey(this, "generator_III");
       
        ShapedRecipe IIIGen = new ShapedRecipe(diamondkey, diamondGen);
        IGen.shape("dGd", "GIG", "dPd");
        IGen.setIngredient('G', Material.LAPIS_ORE);
        IGen.setIngredient('I', Material.IRON_BLOCK);
        IGen.setIngredient('d', Material.DIAMOND);
        IGen.setIngredient('P', Material.PISTON);

       
        getServer().addRecipe(IIIGen);
       
    }
   
}

 

I think you have copied and pasted your code and forgot to edit the variable names.
You never set the shape or ingredient for "IIGen" & "IIIGen"

Edit: I see how long ago this was posted now, ouch