Customer email is required

#0 /var/www/html/app/code/core/Mage/Customer/Model/Resource/Customer.php(76): Mage::exception('Mage_Customer', 'Customer email ...')
#1 /var/www/html/app/code/core/Mage/Eav/Model/Entity/Abstract.php(1122): Mage_Customer_Model_Resource_Customer->_beforeSave(Object(Mage_Customer_Model_Customer))
#2 /var/www/html/app/code/core/Mage/Core/Model/Abstract.php(318): Mage_Eav_Model_Entity_Abstract->save(Object(Mage_Customer_Model_Customer))
#3 /var/www/html/app/code/local/Tdn/Custom/controllers/IndexController.php(9): Mage_Core_Model_Abstract->save()
#4 /var/www/html/app/code/core/Mage/Core/Controller/Varien/Action.php(418): Tdn_Custom_IndexController->IndexAction()
#5 /var/www/html/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(254): Mage_Core_Controller_Varien_Action->dispatch('index')
#6 /var/www/html/app/code/core/Mage/Core/Controller/Varien/Front.php(172): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))
#7 /var/www/html/app/code/core/Mage/Core/Model/App.php(365): Mage_Core_Controller_Varien_Front->dispatch()
#8 /var/www/html/app/Mage.php(683): Mage_Core_Model_App->run(Array)
#9 /var/www/html/epman.com/index.php(84): Mage::run(0, 'website')
#10 {main}