CiviCRM Community Forums (archive)

I'm upgrading my development site to CiviCRM 4.3.1 following these instructions http://wiki.civicrm.org/confluence/display/CRMDOC43/Upgrade+Drupal+Sites+to+4.3+-+Drupal+7. After replaces the old civicrm with the new ones, I tried running the upgrade script at civicrm/upgrade?reset=1, but it throws this error:

Fatal error: [] operator not supported for strings in /www/civitest/docs/sites/all/modules/civicrm/CRM/Core/Session.php on line 508
My googling seems to indicate that no one else has seen this error. Here's the function in question (with line numbers):

488   static function setStatus($text, $title = '', $type = 'alert', $options = array()) {
489     // make sure session is initialized, CRM-8120
490     $session = self::singleton();
491     $session->initialize();
492
493     // default options
494     $options += array('unique' => TRUE);
495
496     if (!isset(self::$_singleton->_session[self::$_singleton->_key]['status'])) {
497       self::$_singleton->_session[self::$_singleton->_key]['status'] = array();
498     }
499     if ($text) {
500       if ($options['unique']) {
501         foreach (self::$_singleton->_session[self::$_singleton->_key]['status'] as $msg) {
502           if ($msg['text'] == $text && $msg['title'] == $title) {
503             return;
504           }
505         }
506       }
507       unset($options['unique']);
508       self::$_singleton->_session[self::$_singleton->_key]['status'][] = array(
509         'text' => $text,
510         'title' => $title,
511         'type' => $type,
512         'options' => $options ? json_encode($options) : NULL,
513       );
514     }
515   }

Any ideas how I can start troubleshooting? Thanks!