"Invalid entity model" error while exporting csv file for products

Question

while exporting a products csv file from backend magento admin panel, it prompts me the following error when i click continue to generate the csv file.

"Invalid Entity Model"

I am using magento 1.6.2 CE.

** edited **

I am using magento default export/import services mean from admin system -> configuration -> export/import .....

plz ask me any question if it is still not clear .

Answer 1

Open abstract class Mage_ImportExport_Model_Export_Adapter_Abstract and replace

$destination = tempnam(sys_get_temp_dir(), 'importexport_');

to

$destination = tempnam(Mage::getBaseDir() . '/var/tmp/'  , 'importexport_');

Answer 2

If you are on a Windows PC, it may be an issue with the permissions on the Temp folder. I had to update the sercurity permissions through right clicking on C:\Windows\Temp and then select Properties->Security->Edit... and set the permissions to the group/user names appropriately. I have given Full Control to all the users, to test it. I am on a Windows 7 PC.