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                                            [2/2]
                                        UndefinedMethodError                    
                    
                 
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Symfony\Component\ErrorHandler\Error\UndefinedMethodError:
Attempted to call an undefined method named "isSite" of class "Joomla\CMS\Application\SiteApplication".
  at /var/www/hauser.cc/www/templates/ago/warp/systems/joomla/helpers/system.php:86
  at SystemWarpHelper->init()
     (/var/www/hauser.cc/www/templates/ago/config.php:21)
  at include_once('/var/www/hauser.cc/www/templates/ago/config.php')
     (/var/www/hauser.cc/www/templates/ago/error.php:13)
  at require('/var/www/hauser.cc/www/templates/ago/error.php')
     (/var/www/hauser.cc/www/libraries/src/Document/HtmlDocument.php:736)
  at Joomla\CMS\Document\HtmlDocument->_loadTemplate()
     (/var/www/hauser.cc/www/libraries/src/Document/HtmlDocument.php:791)
  at Joomla\CMS\Document\HtmlDocument->_fetchTemplate()
     (/var/www/hauser.cc/www/libraries/src/Document/HtmlDocument.php:608)
  at Joomla\CMS\Document\HtmlDocument->parse()
     (/var/www/hauser.cc/www/libraries/src/Document/HtmlDocument.php:626)
  at Joomla\CMS\Document\HtmlDocument->render()
     (/var/www/hauser.cc/www/libraries/src/Document/ErrorDocument.php:139)
  at Joomla\CMS\Document\ErrorDocument->render()
     (/var/www/hauser.cc/www/libraries/src/Error/Renderer/HtmlRenderer.php:70)
  at Joomla\CMS\Error\Renderer\HtmlRenderer->render()
     (/var/www/hauser.cc/www/libraries/src/Exception/ExceptionHandler.php:121)
  at Joomla\CMS\Exception\ExceptionHandler::render()
     (/var/www/hauser.cc/www/libraries/src/Exception/ExceptionHandler.php:72)
  at Joomla\CMS\Exception\ExceptionHandler::handleException()
     (/var/www/hauser.cc/www/libraries/src/Application/CMSApplication.php:323)
  at Joomla\CMS\Application\CMSApplication->execute()
     (/var/www/hauser.cc/www/includes/app.php:61)
  at require_once('/var/www/hauser.cc/www/includes/app.php')
     (/var/www/hauser.cc/www/index.php:32)                
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                                            [1/2]
                                        RuntimeException                    
                    
                 
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RuntimeException:
Failed to start the session because headers have already been sent by "/var/www/hauser.cc/www/libraries/src/Application/WebApplication.php" at line 255.
  at /var/www/hauser.cc/www/libraries/vendor/joomla/session/src/Storage/NativeStorage.php:473
  at Joomla\Session\Storage\NativeStorage->start()
     (/var/www/hauser.cc/www/libraries/src/Session/Storage/JoomlaStorage.php:295)
  at Joomla\CMS\Session\Storage\JoomlaStorage->start()
     (/var/www/hauser.cc/www/libraries/vendor/joomla/session/src/Session.php:406)
  at Joomla\Session\Session->start()
     (/var/www/hauser.cc/www/libraries/vendor/joomla/session/src/Session.php:333)
  at Joomla\Session\Session->has()
     (/var/www/hauser.cc/www/libraries/src/Session/Session.php:191)
  at Joomla\CMS\Session\Session->get()
     (/var/www/hauser.cc/www/libraries/src/Factory.php:334)
  at Joomla\CMS\Factory::getUser()
     (/var/www/hauser.cc/www/libraries/src/Application/SiteApplication.php:552)
  at Joomla\CMS\Application\SiteApplication->initialiseApp()
     (/var/www/hauser.cc/www/libraries/src/Application/SiteApplication.php:218)
  at Joomla\CMS\Application\SiteApplication->doExecute()
     (/var/www/hauser.cc/www/libraries/src/Application/CMSApplication.php:294)
  at Joomla\CMS\Application\CMSApplication->execute()
     (/var/www/hauser.cc/www/includes/app.php:61)
  at require_once('/var/www/hauser.cc/www/includes/app.php')
     (/var/www/hauser.cc/www/index.php:32)                
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