Çözüldü Sunucu hataları nasıl çözülür ?

#0 src/addons/XenGenTr/Xenistatistik/Widget/YeniMesajlar.php(79): XF\Template\Templater->handleTemplateError(2, 'Use of undefine...', '/var/www/vhosts...', 79, Array)
#1 src/XF/Template/Templater.php(1531): XenGenTr\Xenistatistik\Widget\YeniMesajlar->render()
#2 internal_data/code_cache/templates/l2/s1/public/XenistatistikBlok.php(62): XF\Template\Templater->renderWidget('XenYeniMesaj_Wi...', Array, Array)
#3 src/XF/Template/Templater.php(1246): XF\Template\Templater->{closure}(Object(XF\Template\Templater), Array)
#4 src/XF/Template/Templater.php(1320): XF\Template\Templater->renderTemplate('XenistatistikBl...', Array)
#5 internal_data/code_cache/templates/l2/s1/public/forum_list.php(212): XF\Template\Templater->includeTemplate('public:Xenistat...', Array)
#6 src/XF/Template/Templater.php(1246): XF\Template\Templater->{closure}(Object(XF\Template\Templater), Array)
#7 src/XF/Template/Template.php(24): XF\Template\Templater->renderTemplate('forum_list', Array)
#8 src/XF/Mvc/Renderer/Html.php(48): XF\Template\Template->render()
#9 src/XF/Mvc/Dispatcher.php(332): XF\Mvc\Renderer\Html->renderView('XF:Forum\\Listin...', 'public:forum_li...', Array)
#10 src/XF/Mvc/Dispatcher.php(303): XF\Mvc\Dispatcher->renderView(Object(XF\Mvc\Renderer\Html), Object(XF\Mvc\Reply\View))
#11 src/XF/Mvc/Dispatcher.php(44): XF\Mvc\Dispatcher->render(Object(XF\Mvc\Reply\View), 'html')
#12 src/XF/App.php(1889): XF\Mvc\Dispatcher->run()
#13 src/XF.php(328): XF\App->run()
#14 index.php(13): XF::runApp('XF\\Pub\\App')
#15 {main}

array(4) {
  ["url"] => string(1) "/"
  ["referrer"] => string(90) "https://www.site.com/login/two-step?_xfRedirect=https%3A%2F%2Fwww.site.com%2F&remember=1"
  ["_GET"] => array(0) {
  }
  ["_POST"] => array(0) {
  }
}