Error 500 (PHP) installing RC2 on Ubunti

Hello as I am not used to develop using PHP, please give me some hints to solve this situation: AH01071: Got error 'PHP message: PHP Parse error: syntax error, unexpected '[' in /var/www/vhosts/e-learning-test.de/opigno.e-learning-test.de/modules/contrib/opigno_learning_path/src/Controller/LearningPathStepsController.php on line 463\n', referer: http://opigno.e-learning-test.de/core/install.php?rewrite=ok&profile=op… the related code segment is marked >>> // Skip live meetings and instructor-led trainings. $skip_types = ['Meeting', 'ILT']; for ($next_step_index = $current_step_index + 1; $next_step_index < $count >>> && in_array(($next_step = $steps[$next_step_index])['typology'], $skip_types); ++$next_step_index) { $is_mandatory = $next_step['mandatory'] === 1; // unquote thank you in advance Edwin