Cannot Modify Header information

  • Good day,

    The following error only seems to present itself when I hit edit page from the admin bar and try and update a page.

    Cannot modify header information – headers already sent by (output started at /public_html/wp-includes/functions.php:4757) in /public_html/wp-includes/rest-api/class-wp-rest-server.php on line 1642

    I have disabled all plugins, disabled cache CDN, and yet continue to get this error which, from what I can tell, is core WordPress. I have replaced all the files with a fresh download via FTP and am still getting it. Any help to narrow it down would be grateful.

    Thank you.

    • This topic was modified 3 years, 10 months ago by ShaneM.

    The page I need help with: [log in to see the link]

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