Critical on this website

Hello everyone, please i really need help with this, when i try accessing the admin dashboard of my website it gives me an error message “There has been a critical error on this website”, but the website/frontend is not affected, just the admin end. How do i fix this please? I got an email with the recovery mode link but i didn’t see it on time, and the link’s expired. I don’t know how to get a new one or better still fix this issue, someone help me please?

This is the message i get when i check my error logs, how do i fix this please?Fatal error: Uncaught Error: Call to undefined function wp_kses() in /home/centtpgj/public_html/wp-content/db.php:22 Stack trace: #0 /home/centtpgj/public_html/wp-includes/load.php(570): require_once() #1 /home/centtpgj/public_html/wp-settings.php(124): require_wp_db() #2 /home/centtpgj/public_html/wp-config.php(101): require_once(‘/home/centtpgj/…’) #3 /home/centtpgj/public_html/wp-load.php(50): require_once(‘/home/centtpgj/…’) #4 /home/centtpgj/public_html/wp-admin/admin.php(34): require_once(‘/home/centtpgj/…’) #5 /home/centtpgj/public_html/wp-admin/index.php(10): require_once(‘/home/centtpgj/…’) #6 {main} thrown in /home/centtpgj/public_html/wp-content/db.php on line 22

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