Header Modify Error

  • On updating a post I’m getting the following error (database name changed to xyz)
    Warning: Cannot modify header information – headers already sent by (output started at /home/xyz/public_html/wp-content/plugins/multi-column-tag-map/mctagmap_functions.php:59) in /home/xyz/public_html/wp-admin/post.php on line 198

    Warning: Cannot modify header information – headers already sent by (output started at /home/xyz/public_html/wp-content/plugins/multi-column-tag-map/mctagmap_functions.php:59) in /home/xyz/public_html/wp-includes/pluggable.php on line 1219

    Post itself is live but I’m concerned about this “warning”,

    kindly assist
    thanks

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