Solved "attachment.unsetPermission();" problem!

I'm making a custom permissions for an API and I'm having problems with a little thing: I can't remove a permission from an attachment!

I'm using a method called "removePermission(player, permission)" to remove permissions:

Code:java

    private static HashMap<String, PermissionAttachment> permissions = new HashMap<String, PermissionAttachment>();
 
    public PermissionAttachment getPlayerPermissions(Player player){
        if(!permissions.containsKey(player.getName())) permissions.put(player.getName(), player.addAttachment(this.api));
        return permissions.get(player.getName());
    }
 
    public void removePermission(Player player, String permission){
        if(player != null){
            if(!player.hasPermission(permission)) return;
            getPlayerPermissions(player).unsetPermission(permission);
        }
    }

What I'm doing to test it:

Code:java

                if(permissions.hasPermission(player, "teste.permission")){
                    player.sendMessage("teste.permission: true");
                    permissions.removePermission(player, "teste.permission");
                }else{
                    player.sendMessage("teste.permission: false");
                    permissions.addPermission(player, "teste.permission");
                    player.sendMessage("Added!");
                }

Everything works fine, but "removePermission(player, permission)" don't want to. I don't know what I'm doing wrong... D:
Can anyone help me, btw?

Up! D;

EDIT by Moderator: merged posts, please use the edit button instead of double posting.