Fatal error: Uncaught Error: Call to undefined function is_plugin_active() in /home/httpd/vhosts/ludwighohl.ch/httpdocs/cms/wp-content/plugins/timeline-widget-addon-for-elementor/timeline-widget-addon-for-elementor.php:86
Stack trace:
#0 /home/httpd/vhosts/ludwighohl.ch/httpdocs/cms/wp-content/plugins/timeline-widget-addon-for-elementor/timeline-widget-addon-for-elementor.php(76): Timeline_Widget_Addon->cpfm_load_file()
#1 /home/httpd/vhosts/ludwighohl.ch/httpdocs/cms/wp-content/plugins/timeline-widget-addon-for-elementor/timeline-widget-addon-for-elementor.php(58): Timeline_Widget_Addon->__construct()
#2 /home/httpd/vhosts/ludwighohl.ch/httpdocs/cms/wp-content/plugins/timeline-widget-addon-for-elementor/timeline-widget-addon-for-elementor.php(261): Timeline_Widget_Addon::get_instance()
#3 /home/httpd/vhosts/ludwighohl.ch/httpdocs/cms/wp-content/plugins/timeline-widget-addon-for-elementor/timeline-widget-addon-for-elementor.php(264): Timeline_Widget_Addon()
#4 /home/httpd/vhosts/ludwighohl.ch/httpdocs/cms/wp-settings.php( in /home/httpd/vhosts/ludwighohl.ch/httpdocs/cms/wp-content/plugins/timeline-widget-addon-for-elementor/timeline-widget-addon-for-elementor.php on line 86