I have a WordPress website which is working great on front-end but I cannot access the wp-admin. Following is the link to the site /

I get following error while accessing the wp-admin

Fatal error: Uncaught Error: Class 'WP_Privacy_Requests_Table' not found in /var/www/vhosts/222/1106088/webspace/httpdocs/promosaik-interlanguage/wp-admin/includes/class-wp-privacy-data-export-requests-list-table.php:19 Stack trace: #0 /var/www/vhosts/222/1106088/webspace/httpdocs/promosaik-interlanguage/wp-admin/includes/admin.php(79): require_once() #1 /var/www/vhosts/222/1106088/webspace/httpdocs/promosaik-interlanguage/wp-admin/admin.php(92): require_once('/var/www/vhosts...') #2 /var/www/vhosts/222/1106088/webspace/httpdocs/promosaik-interlanguage/wp-admin/index.php(10): require_once('/var/www/vhosts...') #3 {main} thrown in /var/www/vhosts/222/1106088/webspace/httpdocs/promosaik-interlanguage/wp-admin/includes/class-wp-privacy-data-export-requests-list-table.php on line 19