Fatal error: Uncaught Error: Call to undefined function RankMath\wp_rand() in /usr/local/lsws/Wordpress/htdocs/wp-content/plugins/seo-by-rank-math/includes/class-installer.php:605 Stack trace: #0 /usr/local/lsws/Wordpress/htdocs/wp-content/plugins/seo-by-rank-math/includes/class-installer.php(139): RankMath\Installer->create_cron_jobs() #1 /usr/local/lsws/Wordpress/htdocs/wp-content/plugins/seo-by-rank-math/includes/class-installer.php(49): RankMath\Installer->activate() #2 /usr/local/lsws/Wordpress/htdocs/wp-includes/class-wp-hook.php(324): RankMath\Installer->activation() #3 /usr/local/lsws/Wordpress/htdocs/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters() #4 /usr/local/lsws/Wordpress/htdocs/wp-includes/plugin.php(517): WP_Hook->do_action() #5 /usr/local/lsws/Wordpress/htdocs/wp-admin/includes/plugin.php(703): do_action() #6 /usr/local/lsws/Wordpress/htdocs/wp-content/plugins/seo-by-rank-math-pro/rank-math-pro.php(524): activate_plugin() #7 /usr/local/lsws/Wordpress/htdocs/wp-content/plugins/seo-by-rank-math-pro/rank-math-pro.php(187): RankMathPro->activate_free_version() #8 /usr/local/lsws/Wordpress/htdocs/wp-content/plugins/seo-by-rank-math-pro/rank-math-pro.php(135): RankMathPro->are_requirements_met() #9 /usr/local/lsws/Wordpress/htdocs/wp-content/plugins/seo-by-rank-math-pro/rank-math-pro.php(126): RankMathPro->__construct() #10 /usr/local/lsws/Wordpress/htdocs/wp-content/plugins/seo-by-rank-math-pro/rank-math-pro.php(552): RankMathPro::get() #11 /usr/local/lsws/Wordpress/htdocs/wp-content/plugins/seo-by-rank-math-pro/rank-math-pro.php(556): rank_math_pro() #12 /usr/local/lsws/Wordpress/htdocs/wp-settings.php(526): include_once('...') #13 /usr/local/lsws/Wordpress/wp-config.php(129): require_once('...') #14 /usr/local/lsws/Wordpress/htdocs/wp-load.php(55): require_once('...') #15 /usr/local/lsws/Wordpress/htdocs/wp-blog-header.php(13): require_once('...') #16 /usr/local/lsws/Wordpress/htdocs/index.php(17): require('...') #17 {main} thrown in /usr/local/lsws/Wordpress/htdocs/wp-content/plugins/seo-by-rank-math/includes/class-installer.php on line 605