If you have troubles since the update to WordPress 4.5 please read this post before opening a new thread.
Trying to log in to the wp-admin of WordPress for my client’s site and receiving this message:
Warning: Cannot modify header information – headers already sent by (output started at /home/content/k/p/a/kpatinka/html/wp-content/themes/levitation/functions.php:1) in /home/content/k/p/a/kpatinka/html/wp-includes/pluggable.php on line 934
Thanks in advance
Try to deactivate the wp debug mode: http://codex.wordpress.org/Editing_wp-config.php#Debug
This warning message is often triggered by third party plugins (whitespaces after the last ?> closing tag): http://codex.wordpress.org/FAQ_Troubleshooting#How_do_I_solve_the_Headers_already_sent_warning_problem.3F
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