error on enable

i try to make something but on enable it gives me an error on line 21 :/

my code

CODE (open) CODE (close)

Code:

package me.peterxonwiixx.main;

import org.bukkit.Material;
import org.bukkit.configuration.ConfigurationSection;
import org.bukkit.event.Listener;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.ShapedRecipe;
import org.bukkit.plugin.java.JavaPlugin;

public class Main extends JavaPlugin implements Listener {

    public void onEnable() {
        getServer().getPluginManager().registerEvents(this, this);

        getConfig().options().copyDefaults(true);
        saveDefaultConfig();

        for (String recipes : getConfig().getConfigurationSection("recipes").getKeys(true)) {
            Material material = Material.getMaterial(getConfig().getString("recipes." + recipes + ".item"));
            int amount = getConfig().getInt("recipes." + recipes + ".amount");
            ItemStack item = new ItemStack(material, amount);

            ShapedRecipe recipe = new ShapedRecipe(item);

            recipe.shape(getConfig().getList("recipes." + recipes + ".grid")
                    .toArray(new String[getConfig().getList("recipes." + recipes + ".grid").size()]));
            ConfigurationSection items = getConfig().getConfigurationSection("recipes." + recipes + ".items");
            for (String letter : items.getKeys(true)) {
                Material input = Material.getMaterial(getConfig().getString("recipes." + recipes + ".items." + letter));
                recipe.setIngredient(letter.charAt(0), input);
            }
            getServer().addRecipe(recipe);

        }

    }

    public void onDisable() {

        getServer().resetRecipes();

    }
}

error :

ERROR (open) ERROR (close)

Code:

java.lang.NullPointerException
        at org.bukkit.inventory.ItemStack.<init>(ItemStack.java:68) ~[spigot-1.8.8.jar:git-Spigot-5f38d38-18fbb24]
        at me.peterxonwiixx.main.Main.onEnable(Main.java:21) ~[?:?]
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:321) ~[spigot-1.8.8.jar:git-Spigot-5f38d38-18fbb24]
        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:340) [spigot-1.8.8.jar:git-Spigot-5f38d38-18fbb24]
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:405) [spigot-1.8.8.jar:git-Spigot-5f38d38-18fbb24]
        at org.bukkit.craftbukkit.v1_8_R3.CraftServer.loadPlugin(CraftServer.java:357) [spigot-1.8.8.jar:git-Spigot-5f38d38-18fbb24]
        at org.bukkit.craftbukkit.v1_8_R3.CraftServer.enablePlugins(CraftServer.java:317) [spigot-1.8.8.jar:git-Spigot-5f38d38-18fbb24]
        at org.bukkit.craftbukkit.v1_8_R3.CraftServer.reload(CraftServer.java:741) [spigot-1.8.8.jar:git-Spigot-5f38d38-18fbb24]
        at org.bukkit.Bukkit.reload(Bukkit.java:535) [spigot-1.8.8.jar:git-Spigot-5f38d38-18fbb24]
        at org.bukkit.command.defaults.ReloadCommand.execute(ReloadCommand.java:25) [spigot-1.8.8.jar:git-Spigot-5f38d38-18fbb24]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) [spigot-1.8.8.jar:git-Spigot-5f38d38-18fbb24]
        at org.bukkit.craftbukkit.v1_8_R3.CraftServer.dispatchCommand(CraftServer.java:641) [spigot-1.8.8.jar:git-Spigot-5f38d38-18fbb24]
        at org.bukkit.craftbukkit.v1_8_R3.CraftServer.dispatchServerCommand(CraftServer.java:627) [spigot-1.8.8.jar:git-Spigot-5f38d38-18fbb24]
        at net.minecraft.server.v1_8_R3.DedicatedServer.aO(DedicatedServer.java:412) [spigot-1.8.8.jar:git-Spigot-5f38d38-18fbb24]
        at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:375) [spigot-1.8.8.jar:git-Spigot-5f38d38-18fbb24]
        at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654) [spigot-1.8.8.jar:git-Spigot-5f38d38-18fbb24]
        at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557) [spigot-1.8.8.jar:git-Spigot-5f38d38-18fbb24]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_65]

 

Read this. It'll help: http://bukkit.org/threads/how-to-re...ubleshoot-your-own-plugins-by-yourself.32457/ Also it'll help to know what kind of error that is occurring and what causes those errors to happen.

 

Chances are Material.getMaterial(getConfig().getString("recipes."+ recipes +".item")); is returning a null value,
can't be certain as you didnt provide a stack trace