Support » Fixing WordPress » Warning: Cannot modify header information – headers already sent by

  • Hi guys.

    I’m getting this error when I try to log in

    Warning: Cannot modify header information – headers already sent by (output started at /home/xxxxx/public_html/wp-includes/functions.php:1) in /home/xxxxx/public_html/wp-login.php on line 415

    Warning: Cannot modify header information – headers already sent by (output started at /home/xxxxx/public_html/wp-includes/functions.php:1) in /home/xxxxx/public_html/wp-login.php on line 427

    Please help me. I’m new with wordpress.

    EDIT: I tried many things, including this http://codex.wordpress.org/FAQ_Troubleshooting#How_do_I_solve_the_Headers_already_sent_warning_problem.3F but it didn’t solve the problem

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  • Moderator cubecolour

    (@numeeja)

    ɹoʇɐɹǝpoɯ

    If you have completed the steps outlined at the codex link, this might be caused by a plugin. To find out whether this is the case, we need to deactivate all plugins.As you cannot log in to do this by the usual method, rename the plugins folder temporarily to something like /wp-content/deactivatedplugins/ using an ftp client such as filezilla.

    If you can then log in, rename folder back to plugins and reactivate the plugins on by one. Check whether you can still log in each time — using a different browser would make this easier — If it fails at any point after activating a plugin, this will allow you to identify which plugin caused the issue.

    Thanks a lot! I will try it.

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