Fatal error: Uncaught Error: Call to undefined function is_plugin_active() in /wp-content/plugins/olympus-google-fonts/includes/functions.php:424 Stack trace: #0 /wp-content/plugins/olympus-google-fonts/class-olympus-google-fonts.php(113): ogf_is_memberpress_courses_activated() #1 /wp-content/plugins/olympus-google-fonts/class-olympus-google-fonts.php(21): Olympus_Google_Fonts->compatibility() #2 /wp-content/plugins/olympus-google-fonts/class-olympus-google-fonts.php(240): Olympus_Google_Fonts->__construct() #3 /wp-content/plugins/olympus-google-fonts/olympus-google-fonts.php(25): require_once('/wp-content/plu...') #4 /wp-includes/class-wp-hook.php(308): ogf_initiate('') #5 /wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters(NULL, Array) #6 /wp-includes/plugin.php(517): WP_Hook->do_action(Array) #7 /wp-settings.php(486): do_action('plugins_loaded') #8 /wp-config.php(90): require_once('/wp-settings.ph...') #9 /wp-load.php(50): require_once('/wp-config.php') #10 /wp-blog-header.php(13): require_once('/wp-load.php') in /wp-content/plugins/olympus-google-fonts/includes/functions.php on line 424