Can't get a simple command plugin to work

I've just started learning java and how to make bukkit plugins. So to see how far I've gotten I decided to make a simple plugin that displays "hi" whenever someone types the command /hi
When I tried testing it, it said that the command /hi wasn't recognized. Then in my plugin.yml file it said that hi was spelled wrong. Here's my code and the plugin.yml:

Code:

package me.Giudf45.NoFriends;
 
import java.util.logging.Logger;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.plugin.java.JavaPlugin;
 
public class NoFriends extends JavaPlugin {
    private static final Logger log = Logger.getLogger("NoFriends");
@Override
public void onEnable(){
    log.info("Enabled");
}
@Override
public void onDisable(){
    log.info("Disabled");
}
public boolean onCommand(CommandSender sender, Command cmd, String commandLabel, String[] args){
    if(cmd.getName().equalsIgnoreCase("hi")){ // If the player typed /basic then do the following...
        Player player = (Player) sender;
        player.sendMessage("Hello");
        return true;
    } //If this has happened the function will break and return true. if this hasn't happened the a value of false will be returned.
    return false;
}
}

Code:

name: NoFriends
main: me.Giudf45.NoFriends.NoFriends
version: 1
commands:
  hi:
    description: sends message.
    usage: /hi
    permission: NoFriends.hi
    permission: You don't have <permission>.

 

You set the permissions? If not just leave them away

 

Nope. So I removed the 2 permission lines, but it still gets saying that hi is spelled wrong. Any errors in the code?

 

This

Code:

permission: You don't have <permission>.

NVM, didn't reed the last comment.

 

U did forget to write: If (sender instanceof player) {

 

Just remove the "usage: /hi"... It's basicly useless in most cases.
And yeah, you should add a "sender instanceof Player" check in case someone tries to use it from console.

 

All fixed. Thanks guys