Fatal error: Uncaught Error: Call to undefined function mb_strtolower() in /home/uberwolf/public_html/ndssg/wp-content/mu-plugins/endurance-page-cache.php:374
Stack trace:
#0 /home/uberwolf/public_html/ndssg/wp-content/mu-plugins/endurance-page-cache.php(498): Endurance_Page_Cache->to_snake_case('WpSmushApiAuth')
#1 /home/uberwolf/public_html/ndssg/wp-includes/class-wp-hook.php(307): Endurance_Page_Cache->option_handler('wp_smush_api_au...', Array, Array)
#2 /home/uberwolf/public_html/ndssg/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters('', Array)
#3 /home/uberwolf/public_html/ndssg/wp-includes/plugin.php(476): WP_Hook->do_action(Array)
#4 /home/uberwolf/public_html/ndssg/wp-includes/option.php(541): do_action('updated_option', 'wp_smush_api_au...', Array, Array)
#5 /home/uberwolf/public_html/ndssg/wp-includes/option.php(1786): update_option('wp_smush_api_au...', Array, 'no')
#6 /home/uberwolf/public_html/ndssg/wp-includes/option.php(1356): update_network_option(1, 'wp_smush_api_au...', Array)
#7 /home/uberwolf/public_html/ndssg/wp-content/plugins/wp-smushit/wp-smush.php(605): update_site_option('wp_smush_api_au...', Array)
#8 /home/uberwolf/public_html/ndssg/wp-content/plugins/wp-smushit/wp-smush.php(361): WP_Smush->validate_install()
#9 /home/uberwolf/public_html/ndssg/wp-content/plugins/wp-smushit/wp-smush.php(283): WP_Smush->init()
#10 /home/uberwolf/public_html/ndssg/wp-content/plugins/wp-smushit/wp-smush.php(256): WP_Smush->__construct()
#11 /home/uberwolf/public_html/ndssg/wp-includes/class-wp-hook.php(307): WP_Smush::get_instance('')
#12 /home/uberwolf/public_html/ndssg/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters(NULL, Array)
#13 /home/uberwolf/public_html/ndssg/wp-includes/plugin.php(476): WP_Hook->do_action(Array)
#14 /home/uberwolf/public_html/ndssg/wp-settings.php(461): do_action('plugins_loaded')
#15 /home/uberwolf/public_html/ndssg/wp-config.php(101): require_once('/home/uberwolf/...')
#16 /home/uberwolf/public_html/ndssg/wp-load.php(50): require_once('/home/uberwolf/...')
#17 /home/uberwolf/public_html/ndssg/wp-blog-header.php(13): require_once('/home/uberwolf/...')
#18 /home/uberwolf/public_html/ndssg/index.php(17): require('/home/uberwolf/...')
#19 {main}
thrown in /home/uberwolf/public_html/ndssg/wp-content/mu-plugins/endurance-page-cache.php on line 374
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