Can't access wp-admin

I am a complete novice but I have been asked to look into sorting out a local club’s website. When I try to access the /wp-admin/ page the following error comes up:
Fatal error : Call to undefined function wp_add_privacy_policy_content() in /srv/users/aws/apps/morrinsvilleshow/public/wp-admin/includes/misc.php on line 1822
I have absolutely no idea what this means or how to sort it out. Can someone help me please?
Thank you.

That’s not a Cloudflare error. It’s probably caused by a plugin or theme:

OK, thanks. I’ll try contacting Wordpress.

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