Save enchantment item to config

Hey, how to get all enchantement and set this item ? My code in crash

PHP:

public static function setInventory(Player $sender): void {
        $config = self::$instance->getPlayerConfig($sender);
        try {
            if($config->exists("inventory")) {
                $contents = [];
                foreach($config->get("inventory") as $item) {
                    $contents[] = ItemFactory::getInstance()->get("$item[0]", "$item[1]", "$item[2]")
                        ->setCustomName($item[3])
                        ->addEnchantment($item[4]);
                }
                $sender->getInventory()->setContents($contents);
            }
            if($config->exists("armor")) {
                $contentsArmor = [];
                foreach($config->get("armor") as $armor) {
                    $contentsArmor[] = ItemFactory::getInstance()->get("$armor[0]", "$armor[1]", "$armor[2]")
                        ->setCustomName($armor[3]);
                }
                $sender->getArmorInventory()->setContents($contentsArmor);
            }
        } catch(\JsonException $e) {}
    }

    /**
     * @throws \JsonException
     */
    public static function saveInventory(Player $sender) {
        $inv = [];
        foreach($sender->getInventory()->getContents() as $content) {
            $inv[] = [$content->getId(), $content->getMeta(), $content->getCount(), $content->getCustomName(), $content->getEnchantments()];
        }
        $config = self::$instance->getPlayerConfig($sender);
        $config->set("inventory", $inv);
        $config->save();

        $armor = [];
        foreach($sender->getArmorInventory()->getContents() as $content) {
            $armor[] = [$content->getId(), $content->getMeta(), $content->getCount(), $content->getCustomName(),$content->getEnchantments()];
        }
        $config->set("armor", $armor);
        $config->save();
    }

 

What is the error, I have no idea what part of your code is crashing nor would I like to spend 20+ minutes trying to figure it out ;-; I can try to help if you post the error.