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Hi, first, you should update all the addons and styles of TZ Portfolio+ to the latest version.
Second, plz turn on the debug system and send me the screenshots of the error.

Hi,

To my knowledge the Joomla 4.2.8 and TZ Portfolio 2.6.3 are the latest versions. Am I missing something ?

backoffice log:

An error has occurred.

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

Call stack
# Function Location
1 () JROOT/components/com_tz_portfolio_plus/addons/mediatype/flipbook_gallery/tmpl/default.php:47
2 require_once() JROOT/administrator/components/com_tz_portfolio_plus/libraries/plugin/plugin.php:475
3 TZ_Portfolio_PlusPlugin->onMediaTypeDisplayArticleForm() JROOT/libraries/src/Plugin/CMSPlugin.php:279
4 Joomla\CMS\Plugin\CMSPlugin->Joomla\CMS\Plugin\{closure}() JROOT/libraries/vendor/joomla/event/src/Dispatcher.php:486
5 Joomla\Event\Dispatcher->dispatch() JROOT/libraries/src/Application/EventAware.php:107
6 Joomla\CMS\Application\WebApplication->triggerEvent() JROOT/administrator/components/com_tz_portfolio_plus/views/article/view.html.php:87
7 TZ_Portfolio_PlusViewArticle->display() JROOT/libraries/src/MVC/Controller/BaseController.php:639
8 Joomla\CMS\MVC\Controller\BaseController->display() JROOT/administrator/components/com_tz_portfolio_plus/controller.php:158
9 TZ_Portfolio_PlusController->display() JROOT/libraries/src/MVC/Controller/BaseController.php:672
10 Joomla\CMS\MVC\Controller\BaseController->execute() JROOT/administrator/components/com_tz_portfolio_plus/tz_portfolio_plus.php:60
11 require_once() JROOT/libraries/src/Dispatcher/LegacyComponentDispatcher.php:71
12 Joomla\CMS\Dispatcher\LegacyComponentDispatcher::Joomla\CMS\Dispatcher\{closure}() JROOT/libraries/src/Dispatcher/LegacyComponentDispatcher.php:73
13 Joomla\CMS\Dispatcher\LegacyComponentDispatcher->dispatch() JROOT/libraries/src/Component/ComponentHelper.php:355
14 Joomla\CMS\Component\ComponentHelper::renderComponent() JROOT/libraries/src/Application/AdministratorApplication.php:143
15 Joomla\CMS\Application\AdministratorApplication->dispatch() JROOT/libraries/src/Application/AdministratorApplication.php:186
16 Joomla\CMS\Application\AdministratorApplication->doExecute() JROOT/libraries/src/Application/CMSApplication.php:294
17 Joomla\CMS\Application\CMSApplication->execute() JROOT/administrator/includes/app.php:61
18 require_once() JROOT/administrator/index.php:32

Front Office log:


0 Class "JArrayHelper" not found
Call stack
# Function Location
1 () JROOT/components/com_tz_portfolio_plus/addons/content/navigation/models/article.php:142
2 PlgTZ_Portfolio_PlusContentNavigationModelArticle->getNavigation() JROOT/libraries/src/MVC/View/AbstractView.php:146
3 Joomla\CMS\MVC\View\AbstractView->get() JROOT/components/com_tz_portfolio_plus/addons/content/navigation/views/article/view.html.php:28
4 PlgTZ_Portfolio_PlusContentNavigationViewArticle->display() JROOT/administrator/components/com_tz_portfolio_plus/libraries/controller/legacy.php:135
5 TZ_Portfolio_Plus_AddOnControllerLegacy->display() JROOT/administrator/components/com_tz_portfolio_plus/libraries/controller/legacy.php:227
6 TZ_Portfolio_Plus_AddOnControllerLegacy->execute() JROOT/administrator/components/com_tz_portfolio_plus/libraries/plugin/plugin.php:585
7 TZ_Portfolio_PlusPlugin->_getViewHtml() JROOT/administrator/components/com_tz_portfolio_plus/libraries/plugin/plugin.php:551
8 TZ_Portfolio_PlusPlugin->onContentDisplayArticleView() JROOT/administrator/components/com_tz_portfolio_plus/libraries/view.php:99
9 TZ_Portfolio_PlusViewLegacy->_generateLayout() JROOT/administrator/components/com_tz_portfolio_plus/libraries/view.php:40
10 TZ_Portfolio_PlusViewLegacy->generateLayout() JROOT/components/com_tz_portfolio_plus/views/article/view.html.php:363
11 TZ_Portfolio_PlusViewArticle->display() JROOT/libraries/src/MVC/Controller/BaseController.php:639
12 Joomla\CMS\MVC\Controller\BaseController->display() JROOT/administrator/components/com_tz_portfolio_plus/libraries/controller.php:43
13 TZ_Portfolio_PlusControllerLegacy->display() JROOT/components/com_tz_portfolio_plus/controller.php:237
14 TZ_Portfolio_PlusController->display() JROOT/libraries/src/MVC/Controller/BaseController.php:672
15 Joomla\CMS\MVC\Controller\BaseController->execute() JROOT/components/com_tz_portfolio_plus/tz_portfolio_plus.php:59
16 require_once() JROOT/libraries/src/Dispatcher/LegacyComponentDispatcher.php:71
17 Joomla\CMS\Dispatcher\LegacyComponentDispatcher::Joomla\CMS\Dispatcher\{closure}() JROOT/libraries/src/Dispatcher/LegacyComponentDispatcher.php:73
18 Joomla\CMS\Dispatcher\LegacyComponentDispatcher->dispatch() JROOT/libraries/src/Component/ComponentHelper.php:355
19 Joomla\CMS\Component\ComponentHelper::renderComponent() JROOT/libraries/src/Application/SiteApplication.php:200
20 Joomla\CMS\Application\SiteApplication->dispatch() JROOT/libraries/src/Application/SiteApplication.php:241
21 Joomla\CMS\Application\SiteApplication->doExecute() JROOT/libraries/src/Application/CMSApplication.php:294
22 Joomla\CMS\Application\CMSApplication->execute() JROOT/includes/app.php:61
23 require_once() JROOT/index.php:32
We can’t seem to find the page you’re looking for

it seams o be some kind of isue due to joomla 3.5 and jommla 4.0.

Changes i've made to workaround the problems . . .

On file "components/com_tz_portfolio_plus/addons/content/navigation/models/article.php"

Line 142 -> $scatid = ArrayHelper::getColumn($row->second_categories, 'id');
Line 160 -> if ($app->isClient('site') && $app->getLanguageFilter())

on the admin site "components/com_tz_portfolio_plus/addons/mediatype/image_gallery/tmpl/default.php"

Line 47 -> if ($japp->isClient('admin')) {