将Grouped Products添加到购物车时收到错误消息

Question

我在Magento网站（版本1.7.2）上遇到了分组产品的问题。

每当我输入分组产品的数量并点击添加到购物车按钮时，我就会收到以下错误消息：

Please specify the quantity of product(s).

任何人都可以帮我解决这个问题吗？

编辑： 以下是进一步的细节

文件路径：/ app / code / core / Mage / Catalog / Model / Product / Type 文件名：Grouped.php 有问题的文件部分：第276 - 337行 代码：

protected function _prepareProduct(Varien_Object $buyRequest, $product, $processMode)
{
    $product = $this->getProduct($product);
    $productsInfo = $buyRequest->getSuperGroup();
    $isStrictProcessMode = $this->_isStrictProcessMode($processMode);

    if (!$isStrictProcessMode || (!empty($productsInfo) && is_array($productsInfo))) {
        $products = array();
        $associatedProductsInfo = array();
        $associatedProducts = $this->getAssociatedProducts($product);
        if ($associatedProducts || !$isStrictProcessMode) {
            foreach ($associatedProducts as $subProduct) {
                $subProductId = $subProduct->getId();
                if(isset($productsInfo[$subProductId])) {
                    $qty = $productsInfo[$subProductId];
                    if (!empty($qty) && is_numeric($qty)) {

                        $_result = $subProduct->getTypeInstance(true)
                            ->_prepareProduct($buyRequest, $subProduct, $processMode);
                        if (is_string($_result) && !is_array($_result)) {
                            return $_result;
                        }

                        if (!isset($_result[0])) {
                            return Mage::helper('checkout')->__('Cannot process the item.');
                        }

                        if ($isStrictProcessMode) {
                            $_result[0]->setCartQty($qty);
                            $_result[0]->addCustomOption('product_type', self::TYPE_CODE, $product);
                            $_result[0]->addCustomOption('info_buyRequest',
                                serialize(array(
                                    'super_product_config' => array(
                                        'product_type'  => self::TYPE_CODE,
                                        'product_id'    => $product->getId()
                                    )
                                ))
                            );
                            $products[] = $_result[0];
                        } else {
                            $associatedProductsInfo[] = array($subProductId => $qty);
                            $product->addCustomOption('associated_product_' . $subProductId, $qty);
                        }
                    }
                }
            }
        }

        if (!$isStrictProcessMode || count($associatedProductsInfo)) {
            $product->addCustomOption('product_type', self::TYPE_CODE, $product);
            $product->addCustomOption('info_buyRequest', serialize($buyRequest->getData()));

            $products[] = $product;
        }

        if (count($products)) {
            return $products;
        }
    }

    return Mage::helper('catalog')->__('**Please specify the quantity of product(s).**');
}