Fatal error: Uncaught Error: Call to undefined function ThemeisleSDK\Modules\register_setting() in /home/gse2650/www/www.core-design.org/wp-content/plugins/wp-maintenance-mode/vendor/codeinwp/themeisle-sdk/src/Modules/Promotions.php:223 Stack trace: #0 /home/gse2650/www/www.core-design.org/wp-includes/plugin.php(525): ThemeisleSDK\Modules\Promotions->register_settings('') #1 /home/gse2650/www/www.core-design.org/wp-settings.php(393): do_action('init') #2 /home/gse2650/www/www.core-design.org/wp-config.php(84): require_once('/home/gse2650/w...') #3 /home/gse2650/www/www.core-design.org/wp-load.php(37): require_once('/home/gse2650/w...') #4 /home/gse2650/www/www.core-design.org/wp-blog-header.php(13): require_once('/home/gse2650/w...') #5 /home/gse2650/www/www.core-design.org/index.php(17): require('/home/gse2650/w...') #6 {main} thrown in /home/gse2650/www/www.core-design.org/wp-content/plugins/wp-maintenance-mode/vendor/codeinwp/themeisle-sdk/src/Modules/Promotions.php on line 223