Magento Invalid Method Mage Catalog Model Product IsDuplicable

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New version theme is not working in old version.

After upgrading magento or when I design theme in magento and use that theme in magento 1.4.2 that time my product page shows error like

Invalid method Mage_Catalog_Model_Product::isDuplicable

I find the solutin and its work for me.

Copy your product.php file from this path: app\code\core\Mage\Catalog\Model\product.php and replace in your maegnto folder.

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