Undefined constant "T4\Helper\T4PATH_TPL"

plac

Apres une mise à jour Joomla j'ai ce message d'erreur sur mon site
Undefined constant "T4\Helper\T4PATH_TPL"

Que faire ???
Merci

saguaros

plac Undefined constant "T4\Helper\T4PATH_TPL"

UPDATE:

You can backup this file: JROOT/plugins/system/t4/src/t4/T4.php

and replace with this attached file (unzip first)

t4php.zip

3kB

plac

Ma seule solution pour le moment : J'ai désactivé le Plugin T4

saguaros

plac Hello

May I know which template are you using?

Make sure that you're using latest version of template and T4 framework plugin.

alainr

J'ai le même problème. J'ai remis la précédente version du plugin, récupéré d'une sauvegarde du site.
Le template est Headline. Nous l'avions déjà sous Joomla! 3 et il a migré sans trop de problème avec Joomla! 4 puis Joomla! 5.
Je constate que je peux désactiver le plugin T4, sans incidence sur le template Headline. Merci @plac pour le partage !

saguaros

alainr We don’t have any T4 Framework template named “Headline.” Could you please share the URL of the template you’re referring to so we can check it?

alainr

I think you don't have because Headline was for Joomla! 3. And I have T4 plugin, because I try to transfer Headline to T4_blank but when I see that Headline works fine with Joomla! 5, I let it as is.

saguaros

Let me know if you need any further assistance 😉

pnomine

La dernière version du plugin T4_system ne permet pas de cohabiter avec un template autre que joomlart par exemple cassiopeia, il fait planter le site avec l'erreur Undefined constant "T4\Helper\T4PATH_TPL"

ikabod

Same problem with ja_seven:

in /var/www/html/jo_lic/plugins/system/t4/src/t4/Helper/Path.php (line 98)

        }
        public static function addIncludePath (&$path) {
            //JPATH_THEMES
            $template_path = str_replace('\\', '/', T4PATH_TPL);
            for($i = count($path)-1; $i >= 0; $i--) {
                $p = str_replace('\\', '/', $path[$i]);
                if (strpos($p, $template_path) === 0) {
                    $file = substr($p, strlen($template_path));
                    // add base path theme after template path
Path::addIncludePath() in /var/www/html/jo_lic/plugins/system/t4/t4.php (line 312)
PlgSystemT4->onLayoutIncludePaths() in /var/www/html/jo_lic/libraries/src/Plugin/CMSPlugin.php (line 386)
in /var/www/html/jo_lic/libraries/vendor/joomla/event/src/Dispatcher.php -> Joomla\CMS\Plugin\{closure} (line 454)
Dispatcher->dispatch() in /var/www/html/jo_lic/libraries/src/Application/EventAware.php (line 111)
WebApplication->triggerEvent() in /var/www/html/jo_lic/plugins/system/t4/src/joomla/src/Layout/FileLayout.php (line 24)
FileLayout->getDefaultIncludePaths() in /var/www/html/jo_lic/administrator/cache/t4core/FileLayout.php (line 283)
_JFileLayout->getIncludePaths() in /var/www/html/jo_lic/administrator/cache/t4core/FileLayout.php (line 144)
_JFileLayout->getPath() in /var/www/html/jo_lic/administrator/cache/t4core/FileLayout.php (line 116)
_JFileLayout->render() in /var/www/html/jo_lic/libraries/src/Layout/LayoutHelper.php (line 76)
LayoutHelper::render() in /var/www/html/jo_lic/libraries/src/HTML/HTMLHelper.php (line 777)
HTMLHelper::image() in /var/www/html/jo_lic/libraries/src/HTML/HTMLHelper.php (line 307)
HTMLHelper::call() in /var/www/html/jo_lic/libraries/src/HTML/HTMLHelper.php (line 195)
HTMLHelper::_() in /var/www/html/jo_lic/templates/cassiopeia/error.php (line 124)
require('/var/www/html/jo_lic/templates/cassiopeia/error.php') in /var/www/html/jo_lic/libraries/src/Document/HtmlDocument.php (line 734)
HtmlDocument->_loadTemplate() in /var/www/html/jo_lic/libraries/src/Document/HtmlDocument.php (line 791)
HtmlDocument->_fetchTemplate() in /var/www/html/jo_lic/libraries/src/Document/HtmlDocument.php (line 625)
HtmlDocument->parse() in /var/www/html/jo_lic/libraries/src/Document/HtmlDocument.php (line 643)
HtmlDocument->render() in /var/www/html/jo_lic/libraries/src/Document/ErrorDocument.php (line 139)
ErrorDocument->render() in /var/www/html/jo_lic/libraries/src/Error/Renderer/HtmlRenderer.php (line 70)
HtmlRenderer->render() in /var/www/html/jo_lic/libraries/src/Exception/ExceptionHandler.php (line 142)
ExceptionHandler::render() in /var/www/html/jo_lic/libraries/src/Exception/ExceptionHandler.php (line 76)
ExceptionHandler::handleException() in /var/www/html/jo_lic/libraries/src/Application/CMSApplication.php (line 350)
CMSApplication->execute() in /var/www/html/jo_lic/includes/app.php (line 58)
require_once('/var/www/html/jo_lic/includes/app.php') in /var/www/html/jo_lic/index.php (line 51)

But only on live site (behind vpn and not public accessible) and only on the page "contact". Locally on my developer server it works. The difference is php version (local 8.3.3 server: 8.3.6) but I do not think this is the problem.

T4 framework is version 2.5.6 from 2026-06-02.

saguaros

ikabod Hi

I'm working on this issue and there will be update for this soon.

ikabod

I see that in the logs it states cassiopeia but this is only to get a detailed log, which is not possible if ja_seven is the default template.

ikabod

Error is gone after setting the upload_tmp_dir constant in the php.ini