Title: Cannot modify header information – headers already sent Last modified: August 18, 2016 --- # Cannot modify header information – headers already sent * [tmtracy](https://wordpress.org/support/users/tmtracy/) * (@tmtracy) * [21 years, 5 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-headers-already-sent/) * when I try to unaprove comments I get this warning: * `Warning: Cannot modify header information - headers already sent by (output started at /public_html/wp-admin/admin-header.php:8) in /public_html/wp-admin/ post.php on line 569` * anyone know what to do? Viewing 15 replies - 1 through 15 (of 22 total) 1 [2](https://wordpress.org/support/topic/cannot-modify-header-information-headers-already-sent/page/2/?output_format=md) [→](https://wordpress.org/support/topic/cannot-modify-header-information-headers-already-sent/page/2/?output_format=md) * [moshu](https://wordpress.org/support/users/moshu/) * (@moshu) * [21 years, 5 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-headers-already-sent/#post-161986) * [http://codex.wordpress.org/Answers-Trouble_Shooting#Headers_already_sent](http://codex.wordpress.org/Answers-Trouble_Shooting#Headers_already_sent) * Thread Starter [tmtracy](https://wordpress.org/support/users/tmtracy/) * (@tmtracy) * [21 years, 5 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-headers-already-sent/#post-161987) * thanks a lot. cheers! * Thread Starter [tmtracy](https://wordpress.org/support/users/tmtracy/) * (@tmtracy) * [21 years, 5 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-headers-already-sent/#post-161994) * so far…that didn’t work. I checked the files that it wanted, and edited them… still getting that same error. * Thread Starter [tmtracy](https://wordpress.org/support/users/tmtracy/) * (@tmtracy) * [21 years, 5 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-headers-already-sent/#post-161997) * I took out this line on post.php in the admin folder * require_once(‘./admin-header.php’); * that was line 548, under the unaproove section. the aproove section did not have that line, so I took it out under the unaproove section and it’s working fine… anyone know what that line does, or if there will be a problem without it? * Moderator [James Huff](https://wordpress.org/support/users/macmanx/) * (@macmanx) * [21 years, 5 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-headers-already-sent/#post-161999) * Umm… put that line back. You’ll need to call admin-header.php for the proper operation of your admin interface. As quoted in the error, the problem is in admin-header.php on line 8. * [moshu](https://wordpress.org/support/users/moshu/) * (@moshu) * [21 years, 5 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-headers-already-sent/#post-162002) * Hmmm… I don’t think it’s a smart idea to take out lines (especially when they say “require”) from the core files. Stick to the finding the white spaces! What text editor are you using? * Thread Starter [tmtracy](https://wordpress.org/support/users/tmtracy/) * (@tmtracy) * [21 years, 5 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-headers-already-sent/#post-162004) * ` case 'unapprovecomment': * require_once('./admin-header.php'); * check_admin_referer(); * was the line…and after I removed it then it was fine…so, I should look in the file on line 8 then, ok. * I put that line back…and I can not find any problems with admin-header.php and on line 8 is some html… * Thread Starter [tmtracy](https://wordpress.org/support/users/tmtracy/) * (@tmtracy) * [21 years, 5 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-headers-already-sent/#post-162005) * <?php bloginfo(‘name’) ?> › <?php echo $title; ?> — WordPress * that is the line… * Thread Starter [tmtracy](https://wordpress.org/support/users/tmtracy/) * (@tmtracy) * [21 years, 5 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-headers-already-sent/#post-162006) * notepad is what I am using * Thread Starter [tmtracy](https://wordpress.org/support/users/tmtracy/) * (@tmtracy) * [21 years, 5 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-headers-already-sent/#post-162013) * all of my files for whatever reason don’t have line breaks…instead they have an unknown BLOCK char…that I have to go through and replace all of them with a crlf…not sure why that either… * [lbessant](https://wordpress.org/support/users/lbessant/) * (@lbessant) * [21 years, 5 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-headers-already-sent/#post-162018) * Try TextPad or any other editor that understands about Unix-style line breaks. If you search here, you’ll find plenty of suggestions for good text editors, many of them free. Notepad is really not up to the job…. * Moderator [James Huff](https://wordpress.org/support/users/macmanx/) * (@macmanx) * [21 years, 5 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-headers-already-sent/#post-162020) * Download WordPress again, delete the admin-header.php file off of your server and upload a new copy from the fresh download. * For a good text editor, see this list: * [http://codex.wordpress.org/Glossary#Text_editor](http://codex.wordpress.org/Glossary#Text_editor) * Thread Starter [tmtracy](https://wordpress.org/support/users/tmtracy/) * (@tmtracy) * [21 years, 5 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-headers-already-sent/#post-162034) * I tried reinstalling the whole thing…and it is still saying the same error. I have looked and corrected tons of whitespace in files and things are still being borked up…any other thoughts? * Moderator [James Huff](https://wordpress.org/support/users/macmanx/) * (@macmanx) * [21 years, 5 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-headers-already-sent/#post-162035) * What FTP app are you using? * Thread Starter [tmtracy](https://wordpress.org/support/users/tmtracy/) * (@tmtracy) * [21 years, 5 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-headers-already-sent/#post-162037) * filezilla Viewing 15 replies - 1 through 15 (of 22 total) 1 [2](https://wordpress.org/support/topic/cannot-modify-header-information-headers-already-sent/page/2/?output_format=md) [→](https://wordpress.org/support/topic/cannot-modify-header-information-headers-already-sent/page/2/?output_format=md) The topic ‘Cannot modify header information – headers already sent’ is closed to new replies. * In: [Fixing WordPress](https://wordpress.org/support/forum/how-to-and-troubleshooting/) * 22 replies * 6 participants * Last reply from: [jjriv](https://wordpress.org/support/users/jjriv/) * Last activity: [21 years, 4 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-headers-already-sent/page/2/#post-162713) * Status: not resolved ## Topics ### Topics with no replies ### Non-support topics ### Resolved topics ### Unresolved topics ### All topics