Error message when publishing post

  • WordPress database error: [Unknown column ‘user_level’ in ‘where clause’]
    SELECT ID FROM wp_users WHERE user_level > 0

    Warning: Cannot modify header information – headers already sent by (output started at /home/coralsea/public_html/wp-includes/wp-db.php:133) in /home/coralsea/public_html/wp-includes/pluggable.php on line 331

    The above come up on a blank web page every time I publish a post but the post still gets published without a problem. I’ve looked through my plugins but can’t seem to find the source of the issue> Any idea’s?

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