0 Undefined constant "FFALSE"

Call stack
# Function Location
1 () JROOT/includes/ado/events/events_before_202308.php:3467
2 require() JROOT/includes/ado/event_signup.php:819
3 include() JROOT/tmp/regularlabs/custom_php/26663_072ef9ff69eaf8bdf0675849093715f3:12
4 regularlabs_php_5483b9747348ce2cbd38c6b4869552e5() JROOT/libraries/regularlabs/src/Php.php:55
5 RegularLabs\Library\Php::execute() JROOT/plugins/system/sourcerer/src/Replace.php:761
6 RegularLabs\Plugin\System\Sourcerer\Replace::replaceTagsPHP() JROOT/plugins/system/sourcerer/src/Replace.php:519
7 RegularLabs\Plugin\System\Sourcerer\Replace::replaceTagsByType() JROOT/plugins/system/sourcerer/src/Replace.php:394
8 RegularLabs\Plugin\System\Sourcerer\Replace::replaceTags() JROOT/plugins/system/sourcerer/src/Replace.php:267
9 RegularLabs\Plugin\System\Sourcerer\Replace::handleMatch() JROOT/plugins/system/sourcerer/src/Replace.php:64
10 RegularLabs\Plugin\System\Sourcerer\Replace::replace() JROOT/plugins/system/sourcerer/sourcerer.php:102
11 PlgSystemSourcerer->handleOnContentPrepare() JROOT/libraries/regularlabs/src/SystemPlugin.php:268
12 RegularLabs\Library\SystemPlugin->onContentPrepare() JROOT/libraries/src/Plugin/CMSPlugin.php:289
13 Joomla\CMS\Plugin\CMSPlugin->Joomla\CMS\Plugin\{closure}() JROOT/libraries/vendor/joomla/event/src/Dispatcher.php:486
14 Joomla\Event\Dispatcher->dispatch() JROOT/libraries/src/MVC/View/AbstractView.php:312
15 Joomla\CMS\MVC\View\AbstractView->dispatchEvent() JROOT/components/com_content/src/View/Article/HtmlView.php:227
16 Joomla\Component\Content\Site\View\Article\HtmlView->display() JROOT/libraries/src/MVC/Controller/BaseController.php:660
17 Joomla\CMS\MVC\Controller\BaseController->display() JROOT/components/com_content/src/Controller/DisplayController.php:121
18 Joomla\Component\Content\Site\Controller\DisplayController->display() JROOT/libraries/src/MVC/Controller/BaseController.php:693
19 Joomla\CMS\MVC\Controller\BaseController->execute() JROOT/libraries/src/Dispatcher/ComponentDispatcher.php:143
20 Joomla\CMS\Dispatcher\ComponentDispatcher->dispatch() JROOT/components/com_content/src/Dispatcher/Dispatcher.php:56
21 Joomla\Component\Content\Site\Dispatcher\Dispatcher->dispatch() JROOT/libraries/src/Component/ComponentHelper.php:361
22 Joomla\CMS\Component\ComponentHelper::renderComponent() JROOT/libraries/src/Application/SiteApplication.php:208
23 Joomla\CMS\Application\SiteApplication->dispatch() JROOT/libraries/src/Application/SiteApplication.php:249
24 Joomla\CMS\Application\SiteApplication->doExecute() JROOT/libraries/src/Application/CMSApplication.php:293
25 Joomla\CMS\Application\CMSApplication->execute() JROOT/includes/app.php:61
26 require_once() JROOT/index.php:32