Website broken after new update

Hello team,

Thank you for an excellent job on the plugin. I’ve been using it throughout the year now.

But after the recent update, I was getting Error 500 on the website. Please find below the debug log. It seems that there is an issue with the plugin. Any help with the resolution?

Fatal error: Uncaught Error: Call to undefined function current_user_can() in D:\home\site\wwwroot\wp-content\plugins\post-smtp\Postman\PostmanUtils.php:317 Stack trace: #0 D:\home\site\wwwroot\wp-content\plugins\post-smtp\Postman\Postman.php(200): PostmanUtils::isAdmin() #1 D:\home\site\wwwroot\wp-includes\class-wp-hook.php(286): Postman->on_plugins_loaded(”) #2 D:\home\site\wwwroot\wp-includes\class-wp-hook.php(310): WP_Hook->apply_filters(NULL, Array) #3 D:\home\site\wwwroot\wp-includes\plugin.php(453): WP_Hook->do_action(Array) #4 D:\home\site\wwwroot\wp-settings.php(327): do_action(‘plugins_loaded’) #5 D:\home\site\wwwroot\wp-config.php(117): require_once(‘D:\\home\\site\\ww…’) #6 D:\home\site\wwwroot\wp-load.php(37): require_once(‘D:\\home\\site\\ww…’) #7 D:\home\site\wwwroot\wp-blog-header.php(13): require_once(‘D:\\home\\site\\ww…’) #8 D:\home\site\wwwroot\index.php(17): require(‘D:\\home\\site\\ww…’) #9 {main} thrown in D:\home\site\wwwroot\wp-content\plugins\post-smtp\Postman\PostmanUtils.php on line 317

The page I need help with: [log in to see the link]