Set skin to an entity

I am trying to put a skin to an npc but I could not.

Error:

Code:

ErrorException: "Declaration of BedWars\game\entity\villager::setSkin(BedWars\game\entity\Skin $skin): void should be compatible with pocketmine\entity\Human::setSkin(pocketmine\entity\Skin $skin): void" (EXCEPTION) in "plugins/BedWars_v1/src/BedWars/game/entity/villager" at line 75

Code:
Game:

PHP:

    private function initShops() : void{
        foreach($this->teamInfo as $team => $info){
            $shopPos = Utils::stringToVector(":", $info['shopPos']);
            $rotation = explode(":", $info['shopPos']);

            $nbt = Entity::createBaseNBT($shopPos->add(0.5, 0, 0.5), null, $rotation[3], $rotation[4]);
            $path = Server::getInstance()->getDataPath() . "plugin_data/BedWars/skins/villager.png";
            $skin = Utils::getSkinFromFile($path);
            $entity = new villager($this->plugin->getServer()->getLevelByName($this->worldName), $nbt);
            $nbt->setTag(new CompoundTag('Skin', [
                new StringTag('Data', $skin->getSkinData()),
                new StringTag('Name', 'Standard_CustomSlim'),
                new StringTag('GeometryName', 'geometry.player.villager'),
                new ByteArrayTag('GeometryData', villager::GEOMETRY)]));
            $entity->setNameTag(TextFormat::AQUA . "ITEM SHOP\n" . TextFormat::BOLD . TextFormat::YELLOW . "TAP TO USE");
            $entity->setNameTagAlwaysVisible(true);
            $entity->spawnToAll();

            $this->npcs[$entity->getId()] = [$team, 'shop'];
    }

villager:

PHP:

<?php
declare(strict_types=1);

namespace BedWars\game\entity;

use pocketmine\entity\Human;
use pocketmine\entity\object\ItemEntity;
use pocketmine\entity\Skin;
use pocketmine\event\entity\EntityDamageEvent;
use pocketmine\level\Level;
use pocketmine\nbt\tag\CompoundTag;

class villager extends Human {

    public const GEOMETRY = '{
        "geometry.player.villager":{
            "texturewidth": 64,
            "textureheight": 64,
            "visible_bounds_width": 2,
            "visible_bounds_height": 2,
            "visible_bounds_offset": [0, 1, 0],
            "bones": [
                {
                    "name": "head",
                    "pivot": [0, 24, 0],
                    "mirror": true,
                    "cubes": [
                        {"origin": [-4, 24, -4], "size": [8, 10, 8], "uv": [0, 0]},
                    {"origin": [-1, 23, -6], "size": [2, 4, 2], "uv": [24, 0]}
                    ]
                },
                {
                    "name": "body",
                    "pivot": [0, 24, 0],
                    "mirror": true,
                    "cubes": [
                        {"origin": [-4, 12, -3], "size": [8, 12, 6], "uv": [16, 20]},
                        {"origin": [-4, 6, -3], "size": [8, 18, 6], "uv": [0, 38], "inflate": 0.5}
                    ]
                },
                {
                    "name": "jacket",
                    "parent": "body",
                    "pivot": [0, 24, 0],
                    "rotation": [-40, 0, 0],
                    "mirror": true,
                    "cubes": [
                        {"origin": [-4, 16, -1], "size": [8, 4, 4], "uv": [40, 38]},
                        {"origin": [4, 16, -1], "size": [4, 8, 4], "uv": [44, 22]},
                        {"origin": [-8, 16, -1], "size": [4, 8, 4], "uv": [44, 22]}
                    ]
                },
                {
                    "name": "leftLeg",
                    "pivot": [2, 12, 0],
                    "mirror": true,
                    "cubes": [
                        {"origin": [0, 0, -2], "size": [4, 12, 4], "uv": [0, 22]}
                    ]
                },
                {
                    "name": "rightLeg",
                    "pivot": [-2, 12, 0],
                    "mirror": true,
                    "cubes": [
                        {"origin": [-4, 0, -2], "size": [4, 12, 4], "uv": [0, 22]}
                    ]
                }
            ]
        }
    }';

    public function setSkin(Skin $skin) : void{
        parent::setSkin(new Skin($skin->getSkinId(), $skin->getSkinData(), '', 'geometry.player.villager', self::GEOMETRY));
    }
}

 

Skin: http://www.mediafire.com/view/0nouxwwiuzv89zj/villager.png/file

 

Someone?... :c