Fatal error: Uncaught Error: Call to undefined function WSOE() in /var/www/wp-content/plugins/woocommerce-simply-order-export-add-on/includes/update-installer.php:79 Stack trace: #0 /var/www/wp-includes/class-wp-hook.php(288): wsoe_update_installer('') #1 /var/www/wp-includes/class-wp-hook.php(312): WP_Hook->apply_filters(NULL, Array) #2 /var/www/wp-includes/plugin.php(478): WP_Hook->do_action(Array) #3 /var/www/wp-settings.php(523): do_action('init') #4 /var/www/wp-config.php(88): require_once('/var/www/wp-set...') #5 /var/www/wp-load.php(37): require_once('/var/www/wp-con...') #6 /var/www/wp-blog-header.php(13): require_once('/var/www/wp-loa...') #7 /var/www/index.php(17): require('/var/www/wp-blo...') #8 {main} thrown in /var/www/wp-content/plugins/woocommerce-simply-order-export-add-on/includes/update-installer.php on line 79