contact save error

I see these errors quite a bit while editing and saving a contact in civiCRM

Error:
backTrace

/var/www/html/demo1/modules/civicrm/CRM/Core/Error.php, backtrace, 255
/var/www/html/demo1/modules/civicrm/CRM/Utils/Request.php, fatal, 108
/var/www/html/demo1/modules/civicrm/CRM/Contact/Form/Edit.php, retrieve, 152
/var/www/html/demo1/modules/civicrm/CRM/Core/Form.php, preProcess, 283
/var/www/html/demo1/modules/civicrm/CRM/Core/StateMachine.php, buildForm, 142
/var/www/html/demo1/modules/civicrm/CRM/Core/QuickForm/Action/Next.php, perform, 63
/var/www/html/demo1/modules/civicrm/packages/HTML/QuickForm/Controller.php, perform, 195
/var/www/html/demo1/modules/civicrm/packages/HTML/QuickForm/Page.php, handle, 95
/var/www/html/demo1/modules/civicrm/CRM/Core/Controller.php, handle, 220
/var/www/html/demo1/modules/civicrm/CRM/Utils/Wrapper.php, run, 77
/var/www/html/demo1/modules/civicrm/CRM/Core/Invoke.php, run, 484
/var/www/html/demo1/modules/civicrm/CRM/Core/Invoke.php, form, 188
/var/www/html/demo1/modules/civicrm/CRM/Core/Invoke.php, contact, 92
/var/www/html/demo1/modules/civicrm/drupal/civicrm.module, invoke, 319
, civicrm_invoke,
/var/www/html/demo1/includes/menu.inc, call_user_func_array, 418
/var/www/html/demo1/index.php, menu_execute_active_handler, 15

unrecoverable error
Sorry. A non-recoverable error has occurred.

Could not find valid value for ct