Unable to create order from admin in magento 2

Question

Here is server error log:

[proxy_fcgi:error] [pid 14406] [client xxx.2x1.4x.xxx:21633] AH01071: Got error 'PHP message: PHP Fatal error: Uncaught TypeError: Argument 1 passed to Magento\Payment\Gateway\Data\Quote\QuoteAdapter::__construct() must implement interface Magento\Quote\Api\Data\CartInterface, null given, called in /var/www/magento/vendor/magento/framework/ObjectManager/Factory/AbstractFactory.php on line 111 and defined in /var/www/magento/vendor/magento/module-payment/Gateway/Data/Quote/QuoteAdapter.php:32\nStack trace:\n#0 /var/www/magento/vendor/magento/framework/ObjectManager/Factory/AbstractFactory.php(111): Magento\Payment\Gateway\Data\Quote\QuoteAdapter->__construct(NULL, Object(Magento\Payment\Gateway\Data\Quote\AddressAdapterFactory))\n#1 /var/www/magento/vendor/magento/framework/ObjectManager/Factory/Dynamic/Developer.php(66): Magento\Framework\ObjectManager\Factory\AbstractFactory->createObject('Magento\Payment...', Array)\n#2 /var/www/magento/vendor/magento/framework/ObjectManager/ObjectManager.php(56): Magento\Framework\ObjectManager\Factory\Dynamic\Developer->create('Magento\Payment...',...\n', referer: https://magentosite.com/admin/sales/order/index/key/9bafd2f5e462f32d65756b10f575c2e6e76a64ddd16f255487d2a90a081fbb7e/

Answer 1

Please check you construct once , First argument expecting instance of Magento\Quote\Api\Data\CartInterface.

For example :

 protected $_cart;
    public function __construct(
        Magento\Quote\Api\Data\CartInterface $cart,
    ) {
        $this->_cart = $cart;
        parent::__construct($this->_cart);
    }

It will help you to resolve your issue.