Php Magento 2在下订单和重定向到购物车时出现致命错误

“致命错误：'未捕获的TypeError:参数1传递给Magento\SalesRule\Observer\SalesOrderAfterPlaceObserver:：execute（）必须是Magento\Framework\Event\Observer的实例，为空，在第58行的/home/kerstinf/public_html/dev/vendor/Magento/Framework/intercept/Interceptor.php中调用，并在/home/kerstinf/public_html/dev/vendor/Magento/module sales-rule/Observer/salesforderafterplaceobserver.php:58\n堆栈跟踪：\n#0/home/kerstinf/public_html/dev/vendor/magento/framework/Interception/Interceptor.php（58）：magento\SalesRule\Observer\saleorderafterplaceobserver->执行（NULL）\n\1/home/kerstinf/public\html/dev/vendor/magento/framework/Interception/Interceptor.php（138）：magento\SalesRule\Observer\saleorderafterplaceobserver\Interceptor->\uuuuuuuuuu callParent（'execute'，数组）\n#2/home/kerstinf/public_html/dev/vendor/magento/framework/Interception/Interceptor.php（153）：magento\SalesRule\Observer\salesforderafterplaceobserver\Interceptor->magento\framework\Interception\{closure}（对象（magento\framework\Event\Observer））“在第58行的“/home/kerstinf/public_html/dev/vendor/magento/module sales rule/Observer/salesforderafterplaceobserver.php”中”

我正在将参数传递给SalesOrderAfterPlaceObserver类方法，但它仍然给我错误信息

我的SalesOrderAfterPlaceObserver类是

<?php
    /**
     * Copyright © Magento, Inc. All rights reserved.
     * See COPYING.txt for license details.
     */
    namespace Magento\SalesRule\Observer;

    use Magento\Framework\Event\Observer;
    use Magento\Framework\Event\ObserverInterface;

    class SalesOrderAfterPlaceObserver implements ObserverInterface
    {
        /**
         * @var \Magento\SalesRule\Model\RuleFactory
         */
        protected $_ruleFactory;

        /**
         * @var \Magento\SalesRule\Model\RuleFactory
         */
        protected $_ruleCustomerFactory;

        /**
         * @var \Magento\SalesRule\Model\Coupon
         */
        protected $_coupon;
        protected $_observer;
        /**
         * @var \Magento\SalesRule\Model\ResourceModel\Coupon\Usage
         */
        protected $_couponUsage;

        /**
         * @param \Magento\SalesRule\Model\RuleFactory $ruleFactory
         * @param \Magento\SalesRule\Model\Rule\CustomerFactory $ruleCustomerFactory
         * @param \Magento\SalesRule\Model\Coupon $coupon
         * @param \Magento\SalesRule\Model\ResourceModel\Coupon\Usage $couponUsage
         */
        public function __construct(
            \Magento\Framework\Event\Observer $observer,
            \Magento\SalesRule\Model\RuleFactory $ruleFactory,
            \Magento\SalesRule\Model\Rule\CustomerFactory $ruleCustomerFactory,
            \Magento\SalesRule\Model\Coupon $coupon,
            \Magento\SalesRule\Model\ResourceModel\Coupon\Usage $couponUsage
        ) {
            $this->_observer = $observer;
            $this->_ruleFactory = $ruleFactory;
            $this->_ruleCustomerFactory = $ruleCustomerFactory;
            $this->_coupon = $coupon;
            $this->_couponUsage = $couponUsage;
        }

        /**
         * @param EventObserver $observer
         * @return $this
         * @SuppressWarnings(PHPMD.CyclomaticComplexity)
         */
        public function execute(Observer $observer)
        {
            $observer = $this->_observer;
            $order = $observer->getEvent()->getOrder();

            if (!$order || !$order->getAppliedRuleIds()) {
                return $this;
            }

            // lookup rule ids
            $ruleIds = explode(',', $order->getAppliedRuleIds());
            $ruleIds = array_unique($ruleIds);

            $ruleCustomer = null;
            $customerId = $order->getCustomerId();

            // use each rule (and apply to customer, if applicable)
            foreach ($ruleIds as $ruleId) {
                if (!$ruleId) {
                    continue;
                }
                /** @var \Magento\SalesRule\Model\Rule $rule */
                $rule = $this->_ruleFactory->create();
                $rule->load($ruleId);
                if ($rule->getId()) {
                    $rule->loadCouponCode();
                    $rule->setTimesUsed($rule->getTimesUsed() + 1);
                    $rule->save();

                    if ($customerId) {
                        /** @var \Magento\SalesRule\Model\Rule\Customer $ruleCustomer */
                        $ruleCustomer = $this->_ruleCustomerFactory->create();
                        $ruleCustomer->loadByCustomerRule($customerId, $ruleId);

                        if ($ruleCustomer->getId()) {
                            $ruleCustomer->setTimesUsed($ruleCustomer->getTimesUsed() + 1);
                        } else {
                            $ruleCustomer->setCustomerId($customerId)->setRuleId($ruleId)->setTimesUsed(1);
                        }
                        $ruleCustomer->save();
                    }
                }
            }

            $this->_coupon->load($order->getCouponCode(), 'code');
            if ($this->_coupon->getId()) {
                $this->_coupon->setTimesUsed($this->_coupon->getTimesUsed() + 1);
                $this->_coupon->save();
                if ($customerId) {
                    $this->_couponUsage->updateCustomerCouponTimesUsed($customerId, $this->_coupon->getId());
                }
            }

            return $this;
        }
    }

---

您注入了构造函数。如果您仍然面临的问题意味着清除
var/di
文件夹，请尝试运行此命令，然后再次运行相同的命令。我希望这对你有帮助

php bin/magento setup:di:compile

这是magento 2.2版本吗？它是2.2.3版本。我这样做了，但不起作用，我找到了一个解决办法，interceptor.php传递了一个空参数，所以我删除了这个参数，也从SalesOrderAfterPlaceObserver类中删除了它，现在它开始工作了。