arning: Cannot modify header information when editing a page

  • Resolved georgeL13

    (@georgel13)


    4 years, 5 months ago

    Hi,
    When I am in WP Admin and I edit a page that is using the mctagmap shortcode, I get this warning:
    Warning: Cannot modify header information – headers already sent by (output started at /home/USER/public_html/wp-content/plugins/multi-column-tag-map/mctagmap_functions.php:79) in /home/USER/public_html/wp-admin/admin-header.php on line 9

    This happens on all of my pages that use the mctagmap shortcode.

    The warning message quickly disappears and I can edit the pages.

    If I disable the mctagmap plugin, I do not see the warning.

    I am using the Gutenberg editor. The pages have a title and 1 shortcode block.
    Thanks,
    George

Viewing 7 replies - 1 through 7 (of 7 total)
  • Plugin Author tugbucket

    (@tugbucket)

    Hey George,

    I’m not able to reproduce this. Can you give me a little more information?

    What type of block are you using the shortcode in?
    What theme are you using?
    Does this happen anywhere else but in the admin?
    What is your shortcode?

    • This reply was modified 4 years, 5 months ago by tugbucket.
    Thread Starter georgeL13

    (@georgel13)

    Hi,
    I am using a Shortcode block.

    I’m using the SiteOrigin Vantage themes, but I tested with the Twenty Twenty theme and the same thing happens.

    This only happens in the admin. I don’t see the warning message on the live site pages that use mctagmap.

    Shortcode: [mctagmap responsive=”yes” width=”150px” columns=”2″ show_navigation = “yes” show_posts = “yes” from_category = “25”]

    Plugin Author tugbucket

    (@tugbucket)

    Hey @georgel13 ,
    I’m still not able to cause the error locally.

    I guess the next step would be disabling all the plugins and turning them on one at a time and testing to see when the error appears.

    Thread Starter georgeL13

    (@georgel13)

    I enabled the Health Check & Troubleshooting plugin.
    I start with the default theme twenty twenty and all plugins disabled. The warning message does not occur.

    I enable the mctagmap plugin. I see the warning message.

    Plugin Author tugbucket

    (@tugbucket)

    Would it be possible to add me a user to your site so I can see this happening? I’ve tried to reproduce on three sites and still nothing?

    If so can you send me an email at [email protected] ?

    Plugin Author tugbucket

    (@tugbucket)

    Hey @georgel13
    I found and fixed the errors in version 17.0.12 and I already updated your site with the new version.

    Thanks!

    Thread Starter georgeL13

    (@georgel13)

    Great thanks for all of your help!

Viewing 7 replies - 1 through 7 (of 7 total)
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