Getting website error

webaite getting the following error. Can’t login to WordPress.

Fatal error: Uncaught Error: Call to undefined function WPDM\__\wp_generate_password() in /misc/24/425/068/863/0/user/web/kimballtownship.info/wp-content/plugins/download-manager/src/__/Session.php:59 Stack trace: #0 /misc/24/425/068/863/0/user/web/kimballtownship.info/wp-content/plugins/download-manager/src/__/Session.php(28): WPDM\__\Session::initDeviceID() #1 /misc/24/425/068/863/0/user/web/kimballtownship.info/wp-content/plugins/download-manager/src/__/Session.php(41): WPDM\__\Session::init() #2 /misc/24/425/068/863/0/user/web/kimballtownship.info/wp-content/plugins/download-manager/download-manager.php(181): WPDM\__\Session->__construct() #3 /misc/24/425/068/863/0/user/web/kimballtownship.info/wp-content/plugins/download-manager/download-manager.php(151): WPDM\WordPressDownloadManager->__construct() #4 /misc/24/425/068/863/0/user/web/kimballtownship.info/wp-content/plugins/download-manager/download-manager.php(547): WPDM\WordPressDownloadManager::instance() #5 /misc/24/425/068/863/0/user/web/kimballtownship.info/wp-settings.php(545): include_once(‘/misc/24/425/06…’) #6 /misc/24/425/068/863/0/user/web/kimballtownship.info/wp-config.php(92): require_once(‘/misc/24/425/06…’) #7 /misc/24/425/068/863/0/user/web/kimballtownship.info/wp-load.php(50): require_once(‘/misc/24/425/06…’) #8 /misc/24/425/068/863/0/user/web/kimballtownship.info/wp-admin/admin.php(35): require_once(‘/misc/24/425/06…’) #9 /misc/24/425/068/863/0/user/web/kimballtownship.info/wp-admin/index.php(10): require_once(‘/misc/24/425/06…’) #10 {main} thrown in /misc/24/425/068/863/0/user/web/kimballtownship.info/wp-content/plugins/download-manager/src/__/Session.php on line 59

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