[Defender Pro] fatal error defender pro

error Fatal error: Uncaught Error: Class 'WD_Main_Activator' not found in /home/arkaybev/public_html/wp-content/plugins/wp-defender/wp-defender.php:118 Stack trace: #0 /home/arkaybev/public_html/wp-content/plugins/wp-defender/wp-defender.php(100): WP_Defender->__construct() #1 /home/arkaybev/public_html/wp-content/plugins/wp-defender/wp-defender.php(259): WP_Defender::instance() #2 /home/arkaybev/public_html/wp-content/plugins/wp-defender/wp-defender.php(263): wp_defender() #3 /home/arkaybev/public_html/wp-settings.php(342): include_once('/home/arkaybev/...':wink: #4 /home/arkaybev/public_html/wp-config.php(82): require_once('/home/arkaybev/...':wink: #5 /home/arkaybev/public_html/wp-load.php(37): require_once('/home/arkaybev/...':wink: #6 /home/arkaybev/public_html/wp-admin/admin.php(34): require_once('/home/arkaybev/...':wink: #7 /home/arkaybev/public_html/wp-admin/edit.php(10): require_once('/home/arkaybev/...':wink: #8 {main} thrown in /home/arkaybev/public_html/wp-content/plugins/wp-defender/wp-defender.php on line 118

can you help me?
thanks