GoogleBaseXML error

		 /* do
		  {
			//clean all output buffers
		  } while(@ob_end_clean());*/

		  do
		  {
			//clean all output buffers
		  } while(@ob_end_clean());

			   //prices
			   $productPrice =& $product->addChild($tags->price);
			   $productPrice->setData($item->price);

		$productIE = $product->addChild('g:identifier_exists');
		 $productIE->setData('FALSE');

		$productIE = $product->addChild('g:identifier_exists');
		 $productIE->setData('FALSE');
		//prices
		 $productPrice =& $product->addChild($tags->price);
		$productPrice->setData($item->price);

			$show_product_desc = $this->params->get('show_product_desc','full');
			switch($show_product_desc)
			{
				case 'short': $items[$i]->description = $db->f("product_s_desc");
				              break;
				case 'long': $items[$i]->description = $db->f("product_desc");
				              break;
							  
				case 'full':
				default: $items[$i]->description = $db->f("product_s_desc")."\n".$db->f("product_desc");
				              break;
				
			}

$items[$i]->description = strip_tags($items[$i]->description);

var $document_address = 'http://www.ecb.europa.eu/stats/eurofxref/eurofxref-daily.xml';