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