jos-Notice: Could not instantiate mail function.

JSite -> dispatch() @ /var/www/vhosts/binaryviewer.com/httpdocs/bvbackoffice/index.php:43
JComponentHelper :: renderComponent() @ /var/www/vhosts/binaryviewer.com/httpdocs/bvbackoffice/includes/application.php:197
JComponentHelper :: executeComponent() @ /var/www/vhosts/binaryviewer.com/httpdocs/bvbackoffice/libraries/joomla/application/component/helper.php:351
require_once() @ /var/www/vhosts/binaryviewer.com/httpdocs/bvbackoffice/libraries/joomla/application/component/helper.php:383
JController -> execute() @ /var/www/vhosts/binaryviewer.com/httpdocs/bvbackoffice/components/com_content/content.php:16
ContentController -> display() @ /var/www/vhosts/binaryviewer.com/httpdocs/bvbackoffice/libraries/joomla/application/component/controller.php:761
JController -> display() @ /var/www/vhosts/binaryviewer.com/httpdocs/bvbackoffice/components/com_content/controller.php:74
ContentViewCategory -> display() @ /var/www/vhosts/binaryviewer.com/httpdocs/bvbackoffice/libraries/joomla/application/component/controller.php:722
JError :: raiseError() @ /var/www/vhosts/binaryviewer.com/httpdocs/bvbackoffice/components/com_content/views/category/view.html.php:48
JError :: raise() @ /var/www/vhosts/binaryviewer.com/httpdocs/bvbackoffice/libraries/joomla/error/error.php:251
JError :: throwError() @ /var/www/vhosts/binaryviewer.com/httpdocs/bvbackoffice/libraries/joomla/error/error.php:176
call_user_func_array() @ /var/www/vhosts/binaryviewer.com/httpdocs/bvbackoffice/libraries/joomla/error/error.php:214
JError :: handleCallback()
call_user_func() @ /var/www/vhosts/binaryviewer.com/httpdocs/bvbackoffice/libraries/joomla/error/error.php:765
plgSystemQlue404 :: handleError()
Qlue404Helper -> sendMail() @ /var/www/vhosts/binaryviewer.com/httpdocs/bvbackoffice/plugins/system/qlue404/qlue404.php:224
JUtility :: sendMail() @ /var/www/vhosts/binaryviewer.com/httpdocs/bvbackoffice/administrator/components/com_qlue404/helpers/helper.php:89
JMail -> sendMail() @ /var/www/vhosts/binaryviewer.com/httpdocs/bvbackoffice/libraries/joomla/utilities/utility.php:51
JMail -> Send() @ /var/www/vhosts/binaryviewer.com/httpdocs/bvbackoffice/libraries/joomla/mail/mail.php:453
JError :: raiseNotice() @ /var/www/vhosts/binaryviewer.com/httpdocs/bvbackoffice/libraries/joomla/mail/mail.php:86
JError :: raise() @ /var/www/vhosts/binaryviewer.com/httpdocs/bvbackoffice/libraries/joomla/error/error.php:300