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We are using T3 Blank Template in our Joomla 3 website. After update the Joomla 3.x to Joomla 4.x it getting the following error:

`Cannot access protected property Joomla\CMS\Menu\MenuItem::$params
/mnt/web320/e2/09/59157109/htdocs/speedstep.de/Joomla4/plugins/system/t3/includes/core/template.php:555

Call stack

Function Location

1 () JROOT/plugins/system/t3/includes/core/template.php:555
2 T3Template->bodyClass() JROOT/templates/t3_blank/tpls/home-1.php:19
3 include() JROOT/plugins/system/t3/includes/core/template.php:226
4 T3Template->loadLayout() JROOT/templates/t3_blank/index.php:34
5 require() JROOT/libraries/src/Document/HtmlDocument.php:741
6 Joomla\CMS\Document\HtmlDocument->loadTemplate() JROOT/libraries/src/Document/HtmlDocument.php:796
7 Joomla\CMS\Document\HtmlDocument->
fetchTemplate() JROOT/libraries/src/Document/HtmlDocument.php:613
8 Joomla\CMS\Document\HtmlDocument->parse() JROOT/libraries/src/Application/CMSApplication.php:1012
9 Joomla\CMS\Application\CMSApplication->render() JROOT/libraries/src/Application/SiteApplication.php:724
10 Joomla\CMS\Application\SiteApplication->render() JROOT/libraries/src/Application/CMSApplication.php:298
11 Joomla\CMS\Application\CMSApplication->execute() JROOT/includes/app.php:61
12 require_once() JROOT/index.php:32`

Please let me know how to solve this issue?

    jeyganesh changed the title to T3 Framework error Joomla4 Update.
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      jeyganesh Hi

      You should check your customized css and transfer into T3 BS3 template

      As per your instruction we updated the css. But still not open the main menu.

      do we missed something to update?

      It looks like you have 2 languages EN, GE installed, pls make sure that you setup the main menu correctly for each language.

      we reviewed the template position in T3 BS3 Blank template there is shows the position as "mainmenu" but this position not showing in site modules area. there is shows main navigation.

      template:

      Site module:

      why "mainmenu" position not showing on site modules?

        jeyganesh That's name of the menu - the main menu shows on frontend. Please try with other positions or add new position as you wish.

        In template navigation section If we choose the our custom Main Menu then menu displayed in the site. but we are using 2 languages. we changed the other position its working fine for both languages. but only manimenu position not working.

        so how can we handle this?

        In our live website we controlled the both languages main menu only on site modules. but here its not working

          jeyganesh Hi

          For multilingual site, you should duplicate template style for each language and within each template style, you can select associated menu for each language as your screenshot.

          Thanks for your kind support.
          Now both languages working fine.

          In future template update will be any impact of this template styles?

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