After upgrading t3 bs3 blank template J3 to J4, I got 500 error when I click the edit button to update the page from front end following login.
The version of t3 bs3 blank template is 3.0.2 and t3 framework version is 3.1.3.
According to the log below ,edit.php might cause 500 error.
The error happens only when I try to edit from front end. No error in Cassiopeia case.
I suspect it may be t3 bs3 J4 bug. If so, please develop the fix immediately.
Thanks in advance, T.Sejimo

Following is
the log displayed

500 - behavior::tabstate not found.
You may not be able to visit this page because of:

an out-of-date bookmark/favourite
a search engine that has an out-of-date listing for this site
a mistyped address
you have no access to this page
The requested resource was not found.
An error has occurred while processing your request.
Please try one of the following pages:

Home Page
If difficulties persist, please contact the website administrator and report the error below.

behavior::tabstate not found.
/home/wghp/www/wghp07/smcc-tajima/libraries/src/HTML/HTMLHelper.php:141

Call stack

Function Location

1 () JROOT/libraries/src/HTML/HTMLHelper.php:141
2 Joomla\CMS\HTML\HTMLHelper::_() JROOT/plugins/system/t3/base-bs3/html/com_content/form/edit.php:12
3 include() JROOT/plugins/system/t3/includes/core/t3.php(528) : eval()'d code:410
4 Joomla\CMS\MVC\View_JHtmlView->loadTemplate() JROOT/plugins/system/t3/includes/core/t3.php(528) : eval()'d code:203
5 Joomla\CMS\MVC\View_JHtmlView->display() JROOT/components/com_content/src/View/Form/HtmlView.php:197
6 Joomla\Component\Content\Site\View\Form\HtmlView->display() JROOT/libraries/src/MVC/Controller/BaseController.php:645
7 Joomla\CMS\MVC\Controller\BaseController->display() JROOT/components/com_content/src/Controller/DisplayController.php:121
8 Joomla\Component\Content\Site\Controller\DisplayController->display() JROOT/libraries/src/MVC/Controller/BaseController.php:678
9 Joomla\CMS\MVC\Controller\BaseController->execute() JROOT/libraries/src/Dispatcher/ComponentDispatcher.php:143
10 Joomla\CMS\Dispatcher\ComponentDispatcher->dispatch() JROOT/components/com_content/src/Dispatcher/Dispatcher.php:56
11 Joomla\Component\Content\Site\Dispatcher\Dispatcher->dispatch() JROOT/libraries/src/Component/ComponentHelper.php:361
12 Joomla\CMS\Component\ComponentHelper::renderComponent() JROOT/libraries/src/Application/SiteApplication.php:208
13 Joomla\CMS\Application\SiteApplication->dispatch() JROOT/libraries/src/Application/SiteApplication.php:249
14 Joomla\CMS\Application\SiteApplication->doExecute() JROOT/libraries/src/Application/CMSApplication.php:293
15 Joomla\CMS\Application\CMSApplication->execute() JROOT/includes/app.php:61
16 require_once() JROOT/index.php:32

    taksejimo Hi

    Maybe this override from the old version of T3 framework, you can try to rename this folder:

    JROOT/plugins/system/t3/base-bs3/html/com_content/form/

    and see how it goes as the new version doesn't override this form anymore.

    Regards

      What holder to rename you suggest me ？ t3 ,base-bs3, or com_content?
      Regards.

        I changed holder name "form" to "formxy" and tried the edit operation.
        500 error didn"t but another error happened with bellow debug log.
        Regards,

        DEBUG log
        0 - Cannot use object of type Joomla\Component\Content\Site\View\Form\HtmlView as array
        You may not be able to visit this page because of:

        an out-of-date bookmark/favourite
        a search engine that has an out-of-date listing for this site
        a mistyped address
        you have no access to this page
        The requested resource was not found.
        An error has occurred while processing your request.
        Please try one of the following pages:

        Home Page
        If difficulties persist, please contact the website administrator and report the error below.

        Cannot use object of type Joomla\Component\Content\Site\View\Form\HtmlView as array
        /home/wghp/www/wghp07/smcc-tajima/plugins/system/t3/base-bs3/html/layouts/joomla/edit/params.php:13

        Call stack

        Function Location
        1 () JROOT/plugins/system/t3/base-bs3/html/layouts/joomla/edit/params.php:13
        2 include() JROOT/plugins/system/t3/includes/core/t3.php(528) : eval()'d code:128
        3 Joomla\CMS\Layout_FileLayout->render() JROOT/libraries/src/Layout/LayoutHelper.php:76
        4 Joomla\CMS\Layout\LayoutHelper::render() JROOT/components/com_content/tmpl/form/edit.php:100
        5 include() JROOT/plugins/system/t3/includes/core/t3.php(528) : eval()'d code:410
        6 Joomla\CMS\MVC\View_JHtmlView->loadTemplate() JROOT/plugins/system/t3/includes/core/t3.php(528) : eval()'d code:203
        7 Joomla\CMS\MVC\View_JHtmlView->display() JROOT/components/com_content/src/View/Form/HtmlView.php:197
        8 Joomla\Component\Content\Site\View\Form\HtmlView->display() JROOT/libraries/src/MVC/Controller/BaseController.php:645
        9 Joomla\CMS\MVC\Controller\BaseController->display() JROOT/components/com_content/src/Controller/DisplayController.php:121
        10 Joomla\Component\Content\Site\Controller\DisplayController->display() JROOT/libraries/src/MVC/Controller/BaseController.php:678
        11 Joomla\CMS\MVC\Controller\BaseController->execute() JROOT/libraries/src/Dispatcher/ComponentDispatcher.php:143
        12 Joomla\CMS\Dispatcher\ComponentDispatcher->dispatch() JROOT/components/com_content/src/Dispatcher/Dispatcher.php:56
        13 Joomla\Component\Content\Site\Dispatcher\Dispatcher->dispatch() JROOT/libraries/src/Component/ComponentHelper.php:361
        14 Joomla\CMS\Component\ComponentHelper::renderComponent() JROOT/libraries/src/Application/SiteApplication.php:208
        15 Joomla\CMS\Application\SiteApplication->dispatch() JROOT/libraries/src/Application/SiteApplication.php:249
        16 Joomla\CMS\Application\SiteApplication->doExecute() JROOT/libraries/src/Application/CMSApplication.php:293
        17 Joomla\CMS\Application\CMSApplication->execute() JROOT/includes/app.php:61
        18 require_once() JROOT/index.php:32

          taksejimo Hi

          You can access this 'edit' folder:

          JROOT/plugins/system/t3/base-bs3/html/layouts/joomla/edit/

          rename all files except for this one: frontediting_modules.php

            According to your suggestion, I changed holder and file names. It works without any error .
            The problem happened because the way to upgrade from t3 J3 to t3 J4 is wrong.
            Could you please advice me the right upgrade steps?
            Regards, T.Sejimo

              taksejimo You can simply install the new version of T3 plugin into your site.

              The issue here is that in the new version, some override files (like above) are not required anymore but they will not to be removed manually. If you renamed them already, everything will work fine.

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