Repair Failed Joomla 3 to 4 Migration

During Migration our site failed and is now showing errors (detailed below)

This project is to get the site working with Joomla 4 with no loss to the data on the site currently, we do have available on our server a JPA back up file of it on version 3.

We are aware once working on Joomla 4, we have to update our template which is Joomlart Teline V, we have the latest version ready to deploy.

This is a time sensitve project which could lead to further works. Must be able to complete within 24 hours of accepting project.

you can see the errors below or here: [login to view URL]

Errors:

Symfony\Component\ErrorHandler\Error\

UndefinedMethodError

in /home/brca/public_html/plugins/system/jsn_system/[login to view URL] (line 339)

} public function onBeforeCompileHead() { require_once(JPATH_ADMINISTRATOR.'/components/com_jsn/[login to view URL]'); $xml = JFactory::getXML(JPATH_ADMINISTRATOR .'/components/com_jsn/[login to view URL]'); $version = (string)$xml->version; $app=JFactory::getApplication(); // Load Config

plgSystemJsn_System->onBeforeCompileHead()

in /home/brca/public_html/libraries/src/Plugin/[login to view URL] (line 279)

in /home/brca/public_html/libraries/vendor/joomla/event/src/[login to view URL] -> Joomla\CMS\Plugin\{closure} (line 486)

Dispatcher->dispatch('onBeforeCompileHead', object(Event))

in /home/brca/public_html/libraries/src/Application/[login to view URL] (line 107)

WebApplication->triggerEvent('onBeforeCompileHead')

in /home/brca/public_html/libraries/src/Document/Renderer/Html/[login to view URL] (line 61)

MetasRenderer->render(null, array(), null)

in /home/brca/public_html/libraries/src/Document/[login to view URL] (line 565)

HtmlDocument->getBuffer('metas', null, array())

in /home/brca/public_html/libraries/src/Document/[login to view URL] (line 848)

HtmlDocument->_renderTemplate()

in /home/brca/public_html/libraries/src/Document/[login to view URL] (line 633)

HtmlDocument->render(false, array('template' => 'atum', 'directory' => '/home/brca/public_html/administrator/templates', 'debug' => '1', 'csp_nonce' => null, 'templateInherits' => '', 'params' => object(Registry), 'file' => '[login to view URL]'))

in /home/brca/public_html/libraries/src/Document/[login to view URL] (line 139)

ErrorDocument->render(false, array('template' => 'atum', 'directory' => '/home/brca/public_html/administrator/templates', 'debug' => '1', 'csp_nonce' => null, 'templateInherits' => '', 'params' => object(Registry), 'file' => '[login to view URL]'))

in /home/brca/public_html/libraries/src/Error/Renderer/[login to view URL] (line 78)

HtmlRenderer->render(object(Error))

in /home/brca/public_html/libraries/src/Exception/[login to view URL] (line 121)

ExceptionHandler::render(object(Error))

in /home/brca/public_html/libraries/src/Exception/[login to view URL] (line 72)

ExceptionHandler::handleException(object(Error))

in /home/brca/public_html/libraries/src/Application/[login to view URL] (line 323)

CMSApplication->execute()

in /home/brca/public_html/administrator/includes/[login to view URL] (line 61)

require_once('/home/brca/public_html/administrator/includes/[login to view URL]')

in /home/brca/public_html/administrator/[login to view URL] (line 32)

PHP Joomla CSS MySQL HTML

Project ID: #36248098

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