You’ll need the phpMyAdmin app in order to hopefully resolve this. It’s generally accessed through your hosting account or cPanel. It allows you to directly view and manipulate the DB.
If this is a new installation, drop all tables with the wp_kv9a6brmkv_ prefix. Any data you may have added will be lost. Then reinstall WordPress.
If this is not a new installation, verify that the tables are actually missing. It’s possible they exist but the DB user that WP is using has no permission to access them. The tables’ assigned permissions will need to be corrected.
If they are truly missing, yet other WP tables such as posts, terms, etc. still exist, your DB has become seriously corrupted and the rest of the DB may not be reliable. It’d be best to drop everything (but first backup what you have now, just on principle), then restore from a known good backup.
If you don’t have a good backup, you could attempt to patch up the existing DB. Alter the table prefix in the wp-config.php file, then reinstall WP. Rename the new options and postmeta tables using the needed wp_kv9a6brmkv_ prefix. You may drop the remaining new tables. Restore the table prefix in wp-config.php back to what it was. You should regain basic functionality this way, but all of your media uploads (attachment posts) will be lacking crucial information. You’ll need to delete all existing media and re-upload it. This will likely break all the media URLs that exist in your posts. You’ll need to also correct all such URLs. Despite all this effort, it’s possible your site will still not work correctly. We cannot know what else might be wrong with the DB aside from missing tables.
