Support » Fixing WordPress » Warning: Cannot modify header information… and no access to wp-admin

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  • Moderator t-p

    (@t-p)

    Thanks. Tried it several times before but unfortunately it does not resolve the problem. I opened and checked several php files to check for extra spaces but none found.

    Moderator t-p

    (@t-p)

    Try;
    – deactivating ALL (yes all) plugins temporarily to see if this resolves the problem (plugin functions can interfere). If this works, re-activate them individually (one-by-one) to find the problematic plugin(s).
    – If you can’t get into your admin dashboard, try resetting the plugins folder by FTP. Sometimes, an apparently inactive plugin can still cause problems. Also remember to deactivate any plugins in the mu-plugins folder (if you have created such folder). The easiest way is to rename that folder to mu-plugins-old.
    – switching to the unedited default Twenty Fifteen theme (with ALL plugins off) for a moment using the WP dashboard to rule out any theme-specific issue (theme functions can interfere like plugins). If you don’t have access to your admin area, use FTP , or your web-host’s cPanel or whatever file management application your host provides. Navigate to /wp-content/themes/ and switch to the default theme by renaming your current theme’s folder by adding “-old” to the end of the folder name. Alternately, you can remove other themes except the default theme. That will force your site to use it.

    Thanks again. Tried it all but no change. I am using the DIVI Theme. It’s does not seem likely but just a few days ago I added a Google remarketing script in the the Body section of the Divi general setting. Could it be that this problem is due that script? I don’t have access to wp-admin so I am having a hard time finding the file (php or css?) that contains that remarketing script so I can delete it. Do you have any idea which file that could be? BTW, I really appreciate your help.

    Moderator t-p

    (@t-p)

    I added a Google remarketing script in the the Body section of the Divi general setting. Could it be that this problem is due that script?

    I recommend asking the theme’s developers. Forum volunteers are not given access to commercial products, so they would not know why your /custom/commercial theme or plugin is not working properly. The developers/vendors are responsible for supporting their custom/commercial product. See http://codex.wordpress.org/Forum_Welcome#Commercial_Products
    Divi by Elegent theme forum: http://www.elegantthemes.com/forum/ ;

    Thanks Tara for all your help. Hopefully I will post here how this was resolved. Tiziano

    Resolved!

    There was extra code on line 1 for both class-wp-ajax-response.php and pluggable.php file placed on the far right after <?php

    Thanks

    Moderator t-p

    (@t-p)

    Glad know it 🙂

    On my site after the last update, error:

    Warning: shell_exec() [function.shell-exec]: Unable to execute ” in /home/prettyshop/drawmeplease.ru/docs/wp-includes/pomo/entry.php on line 93
    Warning: Cannot modify header information – headers already sent by (output started at /home/prettyshop/drawmeplease.ru/docs/wp-includes/random_compat/cast_to_int.php:1) in /home/prettyshop/drawmeplease.ru/docs/wp-includes/pluggable.php on line 1174

    I hope developers fix it in later version.

    intidigital

    (@intidigital)

    Tiziano, could you please post, how did you fix the problem?

    Cheers

    Philippe.Derathe

    (@philippederathe)

    I have the same issue with DIVI. It seems that my server is on php 5.6. I had no problem before when I was hosted on a server which was on php 5.4 and php 5.6.

    Here is the error message found in the log-error.php file
    PHP Warning: Cannot modify header information – headers already sent by (output started at /home/picanet/public_html/iprcenter.com/wp-content/themes/Divi-child/functions.php:1) in /home/picanet/public_html/iprcenter.com/wp-login.php on line 415

    Thank you

    I also get the same problem when I upgrade my php to 5.6. But as soon as I put it back down to 5.3, the issue goes away. I have gone through all of the troubleshooting methods listed with no success. There aren’t any extra spaces in my files, and even uploading old versions or new ones doesn’t solve the issue. Please let me know if you find a solution. My error lists wp-config.php and pluggable.php as the culprits.

    same !
    Warning: Cannot modify header information – headers already sent by (output started at /home/public_html/wp-content/plugins/jck-woo-quickview/jck-woo-quickview.php:1) in /home/public_html/wp-includes/pluggable.php on line 1174

    I had the same warning. I noticed I had a closing ?> php tag at the end of my (child theme’s) functions.php file. You might want to check that and remove it.

    Warning: In case wordpress doesn’t like you removing it and this solution didn’t help (WP set ups vary depending on theme etc. etc.) make sure you have FTP access to this same functions.php file in case you need to insert the ?> back to get the site back to working order.

    Hope that helps.

    • This reply was modified 1 year, 11 months ago by  Mario. Reason: added words: (child theme's)
    • This reply was modified 1 year, 11 months ago by  Mario.
Viewing 15 replies - 1 through 15 (of 16 total)
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