Title: Warning – cannot modify header information Last modified: August 21, 2016 --- # Warning – cannot modify header information * Resolved [bmrohde](https://wordpress.org/support/users/bmrohde/) * (@bmrohde) * [12 years, 5 months ago](https://wordpress.org/support/topic/warning-cannot-modify-header-information-126/) * After updating Church Admin plugin this morning, I am getting numerous errors and can no longer log in to administer the site. Help please ASAP! * [https://wordpress.org/plugins/church-admin/](https://wordpress.org/plugins/church-admin/) Viewing 7 replies - 1 through 7 (of 7 total) * Thread Starter [bmrohde](https://wordpress.org/support/users/bmrohde/) * (@bmrohde) * [12 years, 5 months ago](https://wordpress.org/support/topic/warning-cannot-modify-header-information-126/#post-4640402) * Don’t worry – all fixed. Don’t install the latest version – not compatible with 3.8.1. Ended up manually downgrading to an earlier version to fix the problem. * Plugin Author [andy_moyle](https://wordpress.org/support/users/andy_moyle/) * (@andy_moyle) * [12 years, 5 months ago](https://wordpress.org/support/topic/warning-cannot-modify-header-information-126/#post-4640403) * One or two people have reported problems updating, but I’ve updated on 3 sites with no problems – all of which are 3.8.1. * What errors did you get? * [reformedmedia](https://wordpress.org/support/users/reformedmedia/) * (@reformedmedia) * [12 years, 5 months ago](https://wordpress.org/support/topic/warning-cannot-modify-header-information-126/#post-4640416) * So, the solution is to revert to an earlier version? I tried to make a back up of my contacts into a CSV file, but it’s giving me this warning, which I think might be related to the above issue. * ` 'Warning: Cannot modify header information - headers already sent by (output started at /home2/hamlin2/public_html/wp-content/plugins/church-admin/index.php: 1) in /home2/hamlin2/public_html/wp-content/plugins/church-admin/includes/pdf_creator. php on line 244'` * It’s also giving me this message when I activate the plugin: * ` 'The plugin generated 6 characters of unexpected output during activation. If you notice “headers already sent” messages, problems with syndication feeds or other issues, try deactivating or removing this plugin.' ` * In addition, it’s showing a 20px high white space between the left nav and the top nav. * I’ve deactivated all my plugins except Church Admin but nothing is conflicting as it’s acting the same way. * [reformedmedia](https://wordpress.org/support/users/reformedmedia/) * (@reformedmedia) * [12 years, 5 months ago](https://wordpress.org/support/topic/warning-cannot-modify-header-information-126/#post-4640417) * In addition to the issues above, It’s breaking my admin section. I see this message when I activate the plugin: * ` 'Warning: Cannot modify header information - headers already sent by (output started at /home2/hamlin2/public_html/wp-content/plugins/church-admin/index.php: 1) in /home2/hamlin2/public_html/wp-includes/pluggable.php on line 896'` * [thefutureisbright](https://wordpress.org/support/users/thepaulcook/) * (@thepaulcook) * [12 years, 5 months ago](https://wordpress.org/support/topic/warning-cannot-modify-header-information-126/#post-4640424) * Hi, I’m getting this error when I install, anyone know what to do? * Hosting on pagely and it’s causing formatting issues in the admin. * The plugin generated 6 characters of unexpected output during activation. If you notice “headers already sent” messages, problems with syndication feeds or other issues, try deactivating or removing this plugin. * Thread Starter [bmrohde](https://wordpress.org/support/users/bmrohde/) * (@bmrohde) * [12 years, 5 months ago](https://wordpress.org/support/topic/warning-cannot-modify-header-information-126/#post-4640426) * andy – same errors as those reported above by other users. Couldn’t log in to admin area (‘Warning: Cannot modify header information – headers already sent by (output started at /home2/hamlin2/public_html/wp-content/plugins/church-admin/ index.php:1)…’ When trying to log in to Admin area, was getting the ‘cookies’ error in addition to the above. I ended going back to release 0.565 before the problem went away. I can now log back in successfully. * Plugin Author [andy_moyle](https://wordpress.org/support/users/andy_moyle/) * (@andy_moyle) * [12 years, 5 months ago](https://wordpress.org/support/topic/warning-cannot-modify-header-information-126/#post-4640431) * I’ve found the issue! * Recently edited files have been encoded with UTF8 with BOM rather than without BOM. It’s the BOM that has caused the extra character(s) and thus the activation errors. * Someone gave me access to their site which has had the activation errors (none of mine did 😉 and so have been testing. After about 6 updates, It now activates. so should work for you all now. * Sorry for the disruption – v0.5857 should activate smoothly Viewing 7 replies - 1 through 7 (of 7 total) The topic ‘Warning – cannot modify header information’ is closed to new replies. * ![](https://ps.w.org/church-admin/assets/icon-256x256.png?rev=2531228) * [Church Admin](https://wordpress.org/plugins/church-admin/) * [Frequently Asked Questions](https://wordpress.org/plugins/church-admin/#faq) * [Support Threads](https://wordpress.org/support/plugin/church-admin/) * [Active Topics](https://wordpress.org/support/plugin/church-admin/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/church-admin/unresolved/) * [Reviews](https://wordpress.org/support/plugin/church-admin/reviews/) * 7 replies * 4 participants * Last reply from: [andy_moyle](https://wordpress.org/support/users/andy_moyle/) * Last activity: [12 years, 5 months ago](https://wordpress.org/support/topic/warning-cannot-modify-header-information-126/#post-4640431) * Status: resolved