If you have phpMyAdmin or another tool you can run an sql command in then please run the following code on your database.
CREATE TABLE IF NOT EXISTS `ps_export_fields` (
`id` int(10) NOT NULL auto_increment,
`field_name` varchar(50) NOT NULL,
`database_name` varchar(50) NOT NULL,
`category` varchar(50) NOT NULL,
`position` int(2) NOT NULL default '0',
PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=1;
CREATE TABLE IF NOT EXISTS `ps_export_set` (
`id` int(10) unsigned NOT NULL auto_increment,
`set_name` varchar(200) NOT NULL,
`set_values` text NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=1;
INSERT INTO `ps_export_fields` (`id`, `field_name`, `database_name`, `category`, `position`) VALUES
(1, 'Product Id', 'id_product', 'products', 0),
(2, 'Product Reference', 'reference', 'products', 0),
(3, 'Name', 'name', 'products_lang', 0),
(4, 'Short Description', 'description_short', 'products_lang', 0),
(5, 'Long Description', 'description', 'products_lang', 0),
(6, 'Quantity', 'quantity', 'products', 0),
(7, 'Price', 'price', 'products', 0),
(8, 'Wholesale Price', 'wholesale_price', 'products', 0),
(9, 'Supplier Name', 'id_supplier', 'products', 0),
(10, 'Manufacturer', 'id_manufacturer', 'products', 0),
(11, 'Tax %', 'id_tax', 'products', 0),
(12, 'Categories', 'id_category_default', 'products', 0),
(13, 'On Sale', 'on_sale', 'products', 0),
(14, 'Reduction Price', 'reduction_price', 'products', 0),
(15, 'Reduction %', 'reduction_percent', 'products', 0),
(16, 'Reduction From', 'reduction_from', 'products', 0),
(17, 'Reduction To', 'reduction_to', 'products', 0),
(18, 'Supplier Reference', 'supplier_reference', 'products', 0),
(19, 'Weight', 'weight', 'products', 0),
(20, 'Date Added', 'date_add', 'products', 0),
(21, 'Active', 'active', 'products', 0),
(22, 'Meta Title', 'meta_title', 'products_lang', 0),
(23, 'Meta Description', 'meta_description', 'products_lang', 0),
(24, 'Meta Keywords', 'meta_keywords', 'products_lang', 0),
(25, 'Available Now', 'available_now', 'products_lang', 0),
(26, 'Available Later', 'available_later', 'products_lang', 0),
(27, 'Tags', 'tags', 'products', 0),
(28, 'Accessories', 'accessories', 'products', 0);