How to convert my template to Joomla 4

(version française plus bas)

Hi
If you are migrating your website to Joomla 4 using a template made with Template Creator CK, you will get a 500 error
This is not a big problem

There are 2 solutions :
1/ without Template Creator CK : go in the template folder >> rename the "html" folder (into "html-old" for example). This wil deactivate the overrides which cause the problem
Your template is now compatible and you can navigate on your website
WARNING : using this method, all the customization for the modules and articles will be lost because of the overrides

2/ with Template Creator CK : go in the interface >> edit the template >> Page >> Informations >> select joomla version 4 >> click on the button to update your template . That's it !

CEd


VERSION FRANCAISE

Salut
Si vous migrez votre site Web vers Joomla 4 à l'aide d'un template créé avec Template Creator CK, vous obtiendrez une erreur 500.
Ce n'est pas un gros problème

Il y a 2 solutions :
1/ sans Template Creator CK : allez dans le dossier du template >> renommez le dossier "html" (en "html-old" par exemple). Cela désactivera les surchages (overrides) qui causent le problème
Votre template est désormais compatible et vous pouvez naviguer sur votre site web
ATTENTION : avec cette méthode, toute la personnalisation des modules et articles sera perdue à cause des surcharges

2/ avec Template Creator CK : allez dans l'interface >> éditez le template >> Page >> Informations >> sélectionnez joomla version 4 >> cliquez sur le bouton pour mettre à jour votre template . C'est tout !

CEd

I did that and that worked however I get an error "Cannot Use A Scalar Value As An Array" when I'm on PHP 8. It works fine on PHP 7.4. I'd like to keep it at 8.

Any ideas?

Thank you!

Hi
please enable the debug mode in the website configuration, and tell me the complete message that you get
CEd

Hi CEd,

I followed the instructions above; however, I still get the error: Error 500 - behavior::caption not found. Below is the outcome when I enable the Debug mode. For your information, when I use the template Cassiopee, the site works.

behavior::caption not found.
/home/accademi/public_html/j4/libraries/src/HTML/HTMLHelper.php:141

Call stack
# Function Location
1 () JROOT/libraries/src/HTML/HTMLHelper.php:141
2 Joomla\CMS\HTML\HTMLHelper::_() JROOT/templates/accademia/html/com_content/featured/default.php:14
3 include() JROOT/libraries/src/MVC/View/HtmlView.php:410
4 Joomla\CMS\MVC\View\HtmlView->loadTemplate() JROOT/libraries/src/MVC/View/HtmlView.php:203
5 Joomla\CMS\MVC\View\HtmlView->display() JROOT/components/com_content/src/View/Featured/HtmlView.php:209
6 Joomla\Component\Content\Site\View\Featured\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

ok please go in your template and rename your folder "html" to something like "html-" to disable it
(this is a method to avoid to delete it because you may have some useful overrides in it that you want to keep)
then go in template creator and update your template

Thank you very much, CEd. It has worked. Can I now delete the folder I have renamed?