Fatal error: Uncaught Error: Class 'WPMailSMTP\WP' not found in /var/www/html/wp-content/plugins/wp-mail-smtp/src/Compatibility/Plugin/PluginAbstract.php:51 Stack trace: #0 /var/www/html/wp-content/plugins/wp-mail-smtp/src/Compatibility/Plugin/PluginAbstract.php(39): WPMailSMTP\Compatibility\Plugin\PluginAbstract::is_activated() #1 /var/www/html/wp-content/plugins/wp-mail-smtp/src/Compatibility/Plugin/Admin2020.php(23): WPMailSMTP\Compatibility\Plugin\PluginAbstract::is_applicable() #2 /var/www/html/wp-content/plugins/wp-mail-smtp/src/Compatibility/Compatibility.php(50): WPMailSMTP\Compatibility\Plugin\Admin2020::is_applicable() #3 /var/www/html/wp-content/plugins/wp-mail-smtp/src/Compatibility/Compatibility.php(31): WPMailSMTP\Compatibility\Compatibility->setup_compatibility() #4 /var/www/html/wp-content/plugins/wp-mail-smtp/src/Core.php(1154): WPMailSMTP\Compatibility\Compatibility->init() #5 /var/www/html/wp-includes/class-wp-hook.php(324): WPMailSMTP\Core->get_compatibility('') #6 /var/www/html/wp-includes/class-wp-ho in /var/www/html/wp-content/plugins/wp-mail-smtp/src/Compatibility/Plugin/PluginAbstract.php on line 51