Error UndefinedMethodError

HTTP 500 Whoops, looks like something went wrong.

Attempted to call an undefined method named "getInstance" of class "Joomla\Registry\Registry".

Exceptions 2

Symfony\Component\ErrorHandler\Error\ UndefinedMethodError

jsn_template_framework_class_loader()
jsn_template_framework_class_loader() in /home/wheniouc/public_html/templates/jsn_metro_pro/error.php (line 24)
    require('/home/wheniouc/public_html/templates/jsn_metro_pro/error.php') in /home/wheniouc/public_html/libraries/src/Document/HtmlDocument.php (line 721)
      ExceptionHandler::handleException() in /home/wheniouc/public_html/libraries/src/Application/CMSApplication.php (line 322)
        CMSApplication->execute() in /home/wheniouc/public_html/includes/app.php (line 61)
          require_once('/home/wheniouc/public_html/includes/app.php') in /home/wheniouc/public_html/index.php (line 32)

            Error

            Call to undefined method Joomla\CMS\Application\SiteApplication::isAdmin()

            plgContentImageShow->onContentPrepare() in /home/wheniouc/public_html/libraries/src/Plugin/CMSPlugin.php (line 289)
              CMSApplication->execute() in /home/wheniouc/public_html/includes/app.php (line 61)
                require_once('/home/wheniouc/public_html/includes/app.php') in /home/wheniouc/public_html/index.php (line 32)

                  Stack Traces 2

                  [2/2] UndefinedMethodError
                  Symfony\Component\ErrorHandler\Error\UndefinedMethodError:
                  Attempted to call an undefined method named "getInstance" of class "Joomla\Registry\Registry".
                  
                    at /home/wheniouc/public_html/plugins/system/jsntplframework/libraries/joomlashine/helper.php:113
                    at JSNTplHelper::getManifestCache()
                       (/home/wheniouc/public_html/plugins/system/jsntplframework/libraries/joomlashine/helper.php:217)
                    at JSNTplHelper::getTemplateVersion()
                       (/home/wheniouc/public_html/plugins/system/jsntplframework/libraries/joomlashine/loader.php:35)
                    at jsn_template_framework_class_loader()
                    at class_exists()
                       (/home/wheniouc/public_html/plugins/system/jsntplframework/libraries/joomlashine/helper.php:196)
                    at JSNTplHelper::getTemplateVersion()
                       (/home/wheniouc/public_html/plugins/system/jsntplframework/libraries/joomlashine/loader.php:35)
                    at jsn_template_framework_class_loader()
                       (/home/wheniouc/public_html/templates/jsn_metro_pro/error.php:24)
                    at require('/home/wheniouc/public_html/templates/jsn_metro_pro/error.php')
                       (/home/wheniouc/public_html/libraries/src/Document/HtmlDocument.php:721)
                    at Joomla\CMS\Document\HtmlDocument->_loadTemplate()
                       (/home/wheniouc/public_html/libraries/src/Document/HtmlDocument.php:776)
                    at Joomla\CMS\Document\HtmlDocument->_fetchTemplate()
                       (/home/wheniouc/public_html/libraries/src/Document/HtmlDocument.php:612)
                    at Joomla\CMS\Document\HtmlDocument->parse()
                       (/home/wheniouc/public_html/libraries/src/Document/HtmlDocument.php:630)
                    at Joomla\CMS\Document\HtmlDocument->render()
                       (/home/wheniouc/public_html/libraries/src/Document/ErrorDocument.php:139)
                    at Joomla\CMS\Document\ErrorDocument->render()
                       (/home/wheniouc/public_html/libraries/src/Error/Renderer/HtmlRenderer.php:70)
                    at Joomla\CMS\Error\Renderer\HtmlRenderer->render()
                       (/home/wheniouc/public_html/libraries/src/Exception/ExceptionHandler.php:126)
                    at Joomla\CMS\Exception\ExceptionHandler::render()
                       (/home/wheniouc/public_html/libraries/src/Exception/ExceptionHandler.php:72)
                    at Joomla\CMS\Exception\ExceptionHandler::handleException()
                       (/home/wheniouc/public_html/libraries/src/Application/CMSApplication.php:322)
                    at Joomla\CMS\Application\CMSApplication->execute()
                       (/home/wheniouc/public_html/includes/app.php:61)
                    at require_once('/home/wheniouc/public_html/includes/app.php')
                       (/home/wheniouc/public_html/index.php:32)                
                  [1/2] Error
                  Error:
                  Call to undefined method Joomla\CMS\Application\SiteApplication::isAdmin()
                  
                    at /home/wheniouc/public_html/plugins/content/imageshow/imageshow.php:35
                    at plgContentImageShow->onContentPrepare()
                       (/home/wheniouc/public_html/libraries/src/Plugin/CMSPlugin.php:289)
                    at Joomla\CMS\Plugin\CMSPlugin->Joomla\CMS\Plugin\{closure}()
                       (/home/wheniouc/public_html/libraries/vendor/joomla/event/src/Dispatcher.php:486)
                    at Joomla\Event\Dispatcher->dispatch()
                       (/home/wheniouc/public_html/libraries/src/MVC/View/AbstractView.php:312)
                    at Joomla\CMS\MVC\View\AbstractView->dispatchEvent()
                       (/home/wheniouc/public_html/components/com_content/src/View/Article/HtmlView.php:227)
                    at Joomla\Component\Content\Site\View\Article\HtmlView->display()
                       (/home/wheniouc/public_html/libraries/src/MVC/Controller/BaseController.php:660)
                    at Joomla\CMS\MVC\Controller\BaseController->display()
                       (/home/wheniouc/public_html/components/com_content/src/Controller/DisplayController.php:121)
                    at Joomla\Component\Content\Site\Controller\DisplayController->display()
                       (/home/wheniouc/public_html/libraries/src/MVC/Controller/BaseController.php:693)
                    at Joomla\CMS\MVC\Controller\BaseController->execute()
                       (/home/wheniouc/public_html/libraries/src/Dispatcher/ComponentDispatcher.php:143)
                    at Joomla\CMS\Dispatcher\ComponentDispatcher->dispatch()
                       (/home/wheniouc/public_html/components/com_content/src/Dispatcher/Dispatcher.php:56)
                    at Joomla\Component\Content\Site\Dispatcher\Dispatcher->dispatch()
                       (/home/wheniouc/public_html/libraries/src/Component/ComponentHelper.php:361)
                    at Joomla\CMS\Component\ComponentHelper::renderComponent()
                       (/home/wheniouc/public_html/libraries/src/Application/SiteApplication.php:208)
                    at Joomla\CMS\Application\SiteApplication->dispatch()
                       (/home/wheniouc/public_html/libraries/src/Application/SiteApplication.php:249)
                    at Joomla\CMS\Application\SiteApplication->doExecute()
                       (/home/wheniouc/public_html/libraries/src/Application/CMSApplication.php:293)
                    at Joomla\CMS\Application\CMSApplication->execute()
                       (/home/wheniouc/public_html/includes/app.php:61)
                    at require_once('/home/wheniouc/public_html/includes/app.php')
                       (/home/wheniouc/public_html/index.php:32)