we are using this extension : https://www.magentocommerce.com/magento-connect/bulk-import-export-orders-to-csv.html
when we try to import one order , its working fine.
when we trying to import the more orders, we are getting this error :
Fatal error: Allowed memory size of 536870912 bytes exhausted (tried to allocate 66 bytes) in /var/www/html/sitename/lib/Zend/Log/Formatter/Simple.php on line 103
but exporting is fine.
please help me to find solution