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Fatal error: Uncaught Error: Call to a member function block() on null in /home/kolenggf/public_html/chamilo/vendor/symfony/framework-bundle/Resources/views/Form/choice_widget_expanded.html.php:1 Stack trace: #0 {main} thrown in /home/kolenggf/public_html/chamilo/vendor/symfony/framework-bundle/Resources/views/Form/choice_widget_expanded.html.php on line 1