#1 /var/www/platform/oursite/sites/all/modules/civicrm/CRM/Utils/Type.php(554): CRM_Core_Error::fatal("One of parameters  (value: Email) is not of the type Integer")
#2 /var/www/platform/oursite/sites/all/modules/civicrm/CRM/Core/DAO.php(1517): CRM_Utils_Type::validate("Email", "Integer")
#3 /var/www/platform/oursite/sites/all/modules/civicrm/CRM/Core/DAO.php(1481): CRM_Core_DAO::composeQuery("n                        SELECT v.labeln

update civicrm_contact set preferred_communication_method=NULL where preferred_communication_method=2;