Magento Unable to submit your request. Please, try again later

Magento Unable to submit your request. Please, try again later  this problem occurs genrally with magento 1.4.0 version  when you submit contact us form of magento . so here is the simple fix

Go to app/code/core/Mage/contacts/controllers/indexController.php and comment  following lines

if (Zend_Validate::is(trim($post[’hideit’]), ‘NotEmpty’)) { 
$error = true; 
}

enjoy 🙂