Email field does not display and error report upon sort

I've been unsuccessful in getting the email field contents to display in advanced search results profile. Have confirmed data populates this field. Header does show. When "sort" is clicked upon in column heading, the following appears:

../civicrm/CRM/Core/Error.php, backtrace, 138
, handle,
../civicrm/packages/PEAR.php, call_user_func, 912
../civicrm/packages/DB.php, PEAR_Error, 966
../civicrm/packages/PEAR.php, DB_Error, 574
../civicrm/packages/DB/common.php, raiseError, 1903
../civicrm/packages/DB/mysql.php, raiseError, 898
../civicrm/packages/DB/mysql.php, mysqlRaiseError, 327
../civicrm/packages/DB/common.php, simpleQuery, 1216
../civicrm/packages/DB/DataObject.php, query, 2394
../civicrm/packages/DB/DataObject.php, _query, 1587
../civicrm/CRM/Core/DAO.php, query, 144
../civicrm/CRM/Core/DAO.php, query, 862
../civicrm/CRM/Contact/BAO/Query.php, executeQuery, 2960
../civicrm/CRM/Contact/Selector.php, searchQuery, 445
../civicrm/CRM/Core/Selector/Controller.php, getRows, 372
../civicrm/CRM/Core/Selector/Controller.php, getRows, 321
../civicrm/CRM/Contact/Form/Search.php, run, 590
../civicrm/CRM/Contact/Form/Search/Advanced.php, postProcess, 260
../civicrm/CRM/Contact/Form/Search.php, postProcess, 487
../civicrm/CRM/Core/Form.php, preProcess, 312
../civicrm/CRM/Core/QuickForm/Action/Display.php, buildForm, 98
../civicrm/packages/HTML/QuickForm/Controller.php, perform, 203
../civicrm/packages/HTML/QuickForm/Page.php, handle, 103
../civicrm/CRM/Core/Controller.php, handle, 232
../civicrm/CRM/Core/Invoke.php, run, 197
../civicrm/drupal/civicrm.module, invoke, 315
, civicrm_invoke,
/usr/www/users/goal/includes/menu.inc, call_user_func_array, 346
/usr/www/users/goal/index.php, menu_execute_active_handler, 18