Solved I need help with my first plugin

Hello, I'm creating my very first plugin, and I wanted it to do something very simple, on command /firework, spawn a firework, I've coded these two classes but it throws an error on my server, this is the error:

Code (Text):

at me.prova.plugin.Main.onEnable(Main.java:10) ~[?:?]
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:321) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:340) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:405) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at org.bukkit.craftbukkit.v1_8_R3.CraftServer.loadPlugin(CraftServer.java:357) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at org.bukkit.craftbukkit.v1_8_R3.CraftServer.enablePlugins(CraftServer.java:317) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at org.bukkit.craftbukkit.v1_8_R3.CraftServer.reload(CraftServer.java:741) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at org.bukkit.Bukkit.reload(Bukkit.java:535) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at org.bukkit.command.defaults.ReloadCommand.execute(ReloadCommand.java:25) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at org.bukkit.craftbukkit.v1_8_R3.CraftServer.dispatchCommand(CraftServer.java:641) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at org.bukkit.craftbukkit.v1_8_R3.CraftServer.dispatchServerCommand(CraftServer.java:627) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.DedicatedServer.aO(DedicatedServer.java:412) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:375) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_241]

This is my main class

Code (Text):

package me.prova.plugin;
import org.bukkit.event.Listener;
import org.bukkit.plugin.java.JavaPlugin;
import net.md_5.bungee.api.ChatColor;

public class Main extends JavaPlugin implements Listener{
    public void onEnable(){
        getServer().getConsoleSender().sendMessage(ChatColor.GREEN + "" + ChatColor.BOLD + "\nPlugin has been enabled\n");
        getCommand("firework").setExecutor(new FireworkPlugin());
    }
   
    public void onDisable(){
        getServer().getConsoleSender().sendMessage(ChatColor.RED + "" + ChatColor.BOLD + "\nPlugin has been disabled\n");
    }
   
}

and this is the other class

Code (Text):

package me.prova.plugin;

import org.bukkit.Color;
import org.bukkit.FireworkEffect;
import org.bukkit.FireworkEffect.Builder;
import org.bukkit.FireworkEffect.Type;
import org.bukkit.command.Command;
import org.bukkit.command.CommandExecutor;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Firework;
import org.bukkit.entity.Player;
import org.bukkit.event.Listener;
import org.bukkit.inventory.meta.FireworkMeta;

public class FireworkPlugin implements CommandExecutor, Listener {

    @Override
    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
        if (command.getName().equalsIgnoreCase("firework")) {
            if (sender instanceof Player) {
                Player player = (Player) sender;
                Firework fw = player.getWorld().spawn(player.getLocation(), Firework.class);
                FireworkMeta fwm = fw.getFireworkMeta();
                Builder builder = FireworkEffect.builder();
               
                fwm.addEffect(builder.flicker(true).withColor(Color.BLUE).build());
                fwm.addEffect(builder.trail(true).build());
                fwm.addEffect(builder.withFade(Color.SILVER).build());
                fwm.addEffect(builder.with(Type.BALL).build());
                fwm.setPower(10);
                fw.setFireworkMeta(fwm);  
            }
        }
        return true;
    }
       
}

 

plugin.yml:

Code (Text):

name: myFirstTest
version: 1.0
main: me.prova.plugin.Main
commands:
firework:
description: Spawns a firework
usage: /firework

 

Ok now it works without errors, thank you very much, my main error was that I was trying to use tab in my plugin.yml, so now I used spaces and it works just fine.