我已经设置了一个非常基本的促销购物车价格规则（Magento 版本。1.6.2.0）只是为了测试这个功能在我的网站中是否有效......但我总是收到相同的消息：“优惠券代码无效”我是对此感到疯狂......这些是我使用的参数：
RULE INFORMATION
General Information
Rule Name *: 10% Off
Description: 10% Off
Status *: Active
Websites *: ALL selected
Customer Groups *: ALL selected
Coupon *: Specific Coupon
Coupon Code *: coupon01
Uses per Coupon: 100
Uses per Customer: 1
From Date: 05/04/2013
To Date: 05/04/2015
Priority: 0
Public In RSS Feed: No
CONDITIONS
If ALL of these conditions are TRUE :
Subtotal equals or greater than 0
ACTIONS
Update prices using the following information
Apply: Percent of Product Price Discount
Discount Amount *: 10
Maximum Qty Discount is Applied To: 0
Discount Qty Step (Buy X): 0
Apply to Shipping Amount: No
Free Shipping: No
Stop Further Rules Processing: No
Apply the rule only to cart items matching the following conditions (leave blank for all items)
If ALL of these conditions are TRUE :
None
LABELS
None
请，关于是什么导致这失败的任何提示？我可以在任何地方跟踪 php 错误吗？检查 system.log 或 exception.log 文件时......根本没有出现与优惠券相关的错误。