jos-Notice: Could not instantiate mail function.

JSite -> dispatch() @ /home/content/96/10184596/html/rrre/jupgrade/index.php:42
JComponentHelper :: renderComponent() @ /home/content/96/10184596/html/rrre/jupgrade/includes/application.php:197
JComponentHelper :: executeComponent() @ /home/content/96/10184596/html/rrre/jupgrade/libraries/joomla/application/component/helper.php:351
require_once() @ /home/content/96/10184596/html/rrre/jupgrade/libraries/joomla/application/component/helper.php:383
JController -> execute() @ /home/content/96/10184596/html/rrre/jupgrade/components/com_content/content.php:16
ContentController -> display() @ /home/content/96/10184596/html/rrre/jupgrade/libraries/joomla/application/component/controller.php:761
JController -> display() @ /home/content/96/10184596/html/rrre/jupgrade/components/com_content/controller.php:74
ContentViewArticle -> display() @ /home/content/96/10184596/html/rrre/jupgrade/libraries/joomla/application/component/controller.php:722
JView -> get() @ /home/content/96/10184596/html/rrre/jupgrade/components/com_content/views/article/view.html.php:32
ContentModelArticle -> getItem() @ /home/content/96/10184596/html/rrre/jupgrade/libraries/joomla/application/component/view.php:386
JError :: raiseError() @ /home/content/96/10184596/html/rrre/jupgrade/components/com_content/models/article.php:158
JError :: raise() @ /home/content/96/10184596/html/rrre/jupgrade/libraries/joomla/error/error.php:251
JError :: throwError() @ /home/content/96/10184596/html/rrre/jupgrade/libraries/joomla/error/error.php:176
call_user_func_array() @ /home/content/96/10184596/html/rrre/jupgrade/libraries/joomla/error/error.php:214
JError :: handleCallback()
call_user_func() @ /home/content/96/10184596/html/rrre/jupgrade/libraries/joomla/error/error.php:765
plgSystemEscope_error_handler :: handleError()
test -> sendMailToAdmin() @ /home/content/96/10184596/html/rrre/jupgrade/plugins/system/escope_error_handler/escope_error_handler.php:139
JMail -> Send() @ /home/content/96/10184596/html/rrre/jupgrade/plugins/system/escope_error_handler/escope_error_handler.php:176
JError :: raiseNotice() @ /home/content/96/10184596/html/rrre/jupgrade/libraries/joomla/mail/mail.php:86
JError :: raise() @ /home/content/96/10184596/html/rrre/jupgrade/libraries/joomla/error/error.php:300