Fatal error: Uncaught Error: Call to undefined function is_admin() in /home/.sites/133/site516/web/WP/wp-content/plugins/sitepress-multilingual-cms/vendor/otgs/installer/includes/installer.class.php:45
Stack trace:
#0 /home/.sites/133/site516/web/WP/wp-content/plugins/sitepress-multilingual-cms/vendor/otgs/installer/includes/installer.class.php(37): WP_Installer->__construct()
#1 /home/.sites/133/site516/web/WP/wp-content/plugins/sitepress-multilingual-cms/vendor/otgs/installer/installer.php(7): WP_Installer::instance()
#2 /home/.sites/133/site516/web/WP/wp-content/plugins/sitepress-multilingual-cms/vendor/otgs/installer/installer.php(11): WP_Installer()
#3 {main}
  thrown in /home/.sites/133/site516/web/WP/wp-content/plugins/sitepress-multilingual-cms/vendor/otgs/installer/includes/installer.class.php on line 45