Solved Plugin not working

I'm not sure how to delete a post but I just wanted to say I figured it out about 5 minutes after I posted this. THE ANSWER: My minecraft server is running on 1.7.10 but my plugin was made using java SE 1.13, so I changed it to 1.7 and it worked. Mods can delete this post or change tag to solved

Hello, I have just started getting into plugin development. I followed a tutorial on how to make your own plugin then export it, so it can work with your server. However, it does not when I do /pl. I reload the server beforehand as they said to do. I have downloaded some plugins, such as world edit, and they work fine, only my custom one doesn't work.

I think these are what people call the logs: https://pastebin.com/MbQuJTXp

Code:
Main:

Code:

package me.trumpet.helloworld;

import me.trumpet.helloworld.commands.HelloCommand;
import org.bukkit.plugin.java.JavaPlugin;

public class Main extends JavaPlugin{
 
    @Override
    public void onEnable()
    {
        System.out.println("Plugin works woohoo!");
        new HelloCommand(this);
    }
 

}

HelloCommand

Code:

package me.trumpet.helloworld.commands;

import me.trumpet.helloworld.Main;
import org.bukkit.command.Command;
import org.bukkit.command.CommandExecutor;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;



public class HelloCommand implements CommandExecutor {
    @SuppressWarnings("unused")
    private Main plugin;
 
    public HelloCommand(Main plugin)
    {
        this.plugin = plugin;
        plugin.getCommand("hello").setExecutor(this);
    }
 
    @Override
    public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {
        if(!(sender instanceof Player))
        {
            sender.sendMessage("Only players may execute!");
            return true;
        }
        Player p = (Player) sender;
     
        if(p.hasPermission("hello.use"))
        {
            p.sendMessage("First plugin yess!");
            return true;
        }
        else
        {
            p.sendMessage("You do not have permission to execute this command!");
         
        }
     
        return false;
    }
}

Code:

plugin.yml
name: HelloWorld
version: 1.0
author: trumpet
main: me.trumpet.helloworld.Main
description: first minecraft spigot plugin!

commands:
    hello:
        aliases: [hi]