Undefined variable: rootdir forms.inc on line 6

mdsupport wrote on Monday, June 15, 2015:

Is there any patch to prevent this message block recurring every few seconds

PHP Notice:  Undefined variable: rootdir in /var/www/html/openemr42/library/forms.inc on line 6
PHP Stack trace:
PHP   1. {main}() /var/www/html/openemr42/library/ajax/execute_background_services.php:0
PHP   2. execute_background_service_calls() /var/www/html/openemr42/library/ajax/execute_background_services.php:164
PHP   3. require_once() /var/www/html/openemr42/library/ajax/execute_background_services.php:129
PHP   4. require_once() /var/www/html/openemr42/library/direct_message_check.inc:29
PHP   5. require_once() /var/www/html/openemr42/controllers/C_Document.class.php:13