Plugin Help Error with 1.8 Plugins

Hi, Some days ago, I started to make 1.8 minecraft bukkit plugins. I got a good result with 1.7 plugins...
So, with all the plugins that I code, it says me this error:
"Could not load 'plugins\(myplugin).jar' in folder 'plugins' and this more:
I don't know what I'm doing wrong :c, here it's the plugin that I've try recently:

Code:

package me.slimeg4mes;

import net.md_5.bungee.api.ChatColor;

import org.bukkit.Bukkit;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.plugin.java.JavaPlugin;

public class OCVisibility extends JavaPlugin{
   
    @Override
    public void onEnable() {
        getLogger().info("Plugin enabled properly");
    }
   
    @Override
    public void onDisable() {
       
    }
   
    public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {
       
        if (cmd.getName().equalsIgnoreCase("visoff") && sender instanceof Player) {
           
            Player p = (Player) sender;
           
            for (Player hplayer : Bukkit.getOnlinePlayers())
                p.hidePlayer(hplayer);
               p.sendMessage(ChatColor.GREEN + "[Test]" + ChatColor.YELLOW + " Visibility OFF");
           
        }
       
        return false;
       
    }

        public boolean onCommand1(CommandSender sender, Command cmd, String label, String[] args) {
           
            if (cmd.getName().equalsIgnoreCase("vison") && sender instanceof Player) {
               
                Player p = (Player) sender;
               
                for (Player hplayer : Bukkit.getOnlinePlayers())
                    p.showPlayer(hplayer);
                   p.sendMessage(ChatColor.GREEN + "[Test]" + ChatColor.YELLOW + " Visibility ON");
               
            }
           
            return false;
           
        }
}

 

Moved to Bukkit Alternates.

 

@XSlimeG4mesX Simple error. Your 'main' field in plugin.yml is right now 'me.slimeg4mes'. Change it to 'me.slimeg4mes.OCVisibility'.