Solved Java throwing me an error I don't even know how to read.

I'm pretty new to the Bukkit community, it feels like taking a blind guess whenever I add something to my code. Just from that information alone, it's no surprise that Java is throwing me an error. Just to clarify, I can read most Java errors just fine, but my plugin appears to be setting off a chain reaction. An error in my plugin leads to an error in the Bukkit's code leads to an error in the Minecraft server code.

I don't even know what to say other than I feel like the problem stems from the commands I have.

EDIT: I fixed this almost immediately after posting. Here's the solution for anyone who has the same problem.

Before, my plugin.yml looked like this:

Code:

name: GradeAlert
version: 1.0
main: me.ClickbaitDurv.GradeAlert.MainClass
description: An alert plugin.

commands:
    gradehelp:
        usage: /gradehelp

The command 'gradehelp' in the plugin.yml was supposed to be the command 'ghelp' in my actual code. I also added the other command that was missing from the plugin.yml file. The lesson here is to make sure your plugin.yml is up-to-date!

Code:

name: GradeAlert
version: 1.0
main: me.ClickbaitDurv.GradeAlert.MainClass
description: An alert plugin.

commands:
    ghelp:
        usage: /<command>
    galert:
        usage: /<command> <message>

Here's the error I get

Code:

[19:54:29 ERROR]: Error occurred while enabling GradeAlert v1.0 (Is it up to date?)
java.lang.NullPointerException: null
        at me.ClickbaitDurv.GradeAlert.MainClass.onEnable(MainClass.java:11) ~[?:?]
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:264) ~[spigot-1.12.jar:git-Spigot-99c2a37-d35483b]
        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:337) [spigot-1.12.jar:git-Spigot-99c2a37-d35483b]
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:402) [spigot-1.12.jar:git-Spigot-99c2a37-d35483b]
        at org.bukkit.craftbukkit.v1_12_R1.CraftServer.enablePlugin(CraftServer.java:378) [spigot-1.12.jar:git-Spigot-99c2a37-d35483b]
        at org.bukkit.craftbukkit.v1_12_R1.CraftServer.enablePlugins(CraftServer.java:327) [spigot-1.12.jar:git-Spigot-99c2a37-d35483b]
        at net.minecraft.server.v1_12_R1.MinecraftServer.t(MinecraftServer.java:421) [spigot-1.12.jar:git-Spigot-99c2a37-d35483b]
        at net.minecraft.server.v1_12_R1.MinecraftServer.l(MinecraftServer.java:382) [spigot-1.12.jar:git-Spigot-99c2a37-d35483b]
        at net.minecraft.server.v1_12_R1.MinecraftServer.a(MinecraftServer.java:337) [spigot-1.12.jar:git-Spigot-99c2a37-d35483b]
        at net.minecraft.server.v1_12_R1.DedicatedServer.init(DedicatedServer.java:272) [spigot-1.12.jar:git-Spigot-99c2a37-d35483b]
        at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:544) [spigot-1.12.jar:git-Spigot-99c2a37-d35483b]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_141]

Main Class (titled MainClass.java)

Code:

package me.ClickbaitDurv.GradeAlert.commands;

import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.command.Command;
import org.bukkit.command.CommandExecutor;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;

public class PrefixCommand implements CommandExecutor {

    @Override
    public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {
        Player player = (Player) sender;
        if (sender instanceof Player ) {
            if (cmd.getName().equalsIgnoreCase("ghelp")) {
                player.sendMessage(ChatColor.translateAlternateColorCodes('&', "&6&lGradeAlert Help:\n&7&oNo commands yet!"));
                return true;
            }
            if (cmd.getName().equalsIgnoreCase("galert")) {
                String broadcastMsg = "";

                for(int i = 0; i < args.length; i++){
                    String arg = args[i] + " ";
                    broadcastMsg = broadcastMsg + arg;
                }
              
                Bukkit.broadcastMessage((ChatColor.translateAlternateColorCodes('&', broadcastMsg)));
                return true;
            }
        } else {
            sender.sendMessage("Whoops! GradeAlert commands can only be run by a non-console user with appropriate permissions!");
        }
        return true;
    }

}

PrefixCommand.java

Code:

package me.ClickbaitDurv.GradeAlert.commands;

import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.command.Command;
import org.bukkit.command.CommandExecutor;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;

public class PrefixCommand implements CommandExecutor {

    @Override
    public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {
        Player player = (Player) sender;
        if (sender instanceof Player ) {
            if (cmd.getName().equalsIgnoreCase("ghelp")) {
                player.sendMessage(ChatColor.translateAlternateColorCodes('&', "&6&lGradeAlert Help:\n&7&oNo commands yet!"));
                return true;
            }
            if (cmd.getName().equalsIgnoreCase("galert")) {
                String broadcastMsg = "";

                for(int i = 0; i < args.length; i++){
                    String arg = args[i] + " ";
                    broadcastMsg = broadcastMsg + arg;
                }
              
                Bukkit.broadcastMessage((ChatColor.translateAlternateColorCodes('&', broadcastMsg)));
                return true;
            }
        } else {
            sender.sendMessage("Whoops! GradeAlert commands can only be run by a non-console user with appropriate permissions!");
        }
        return true;
    }

}

plugin.yml

Code:

name: GradeAlert
version: 1.0
main: me.ClickbaitDurv.GradeAlert.MainClass
description: An alert plugin.

commands:
    gradehelp:
        usage: /gradehelp

 

@YouDontKnowO
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