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i encounter this error when i press add to cart button
Notice: Indirect modification of overloaded property Mage_Checkout_Block_Cart_Shipping::$_rates has no effect in /home/www/apache2-default/lhcorporatewear/svnlhcorporatewear/trunk/app/code/core/Mage/Checkout/Block/Cart/Shipping.php on line 116