mark256
Hi,
The issue occurs because on the 'forseo error page,' they triggered the event 'onAfterRender' which failed.
To resolve this, you can open the file plugins\system\forseo\platform\helpers\errorpages\defaultrenderer.php
and change the content of line 105
to:
$this->app->triggerEvent('onAfterRender', ['subject' => $this->app]);
Afterward, you can test the latest t4 package here.
Regards