I am working on the back office, so we can easily edit an article. Somehow each time I save the modifications, it send me to blank http://nnnnnnnn/wp-admin/post.php with this error.
Warning: Cannot modify header information - headers already sent by (output started at /homepages/nnnn/hhh/mmmm/ddd/wp-content/themes/ssss/) in /homepages/nn/nnnnn/nnnn/nnnn/wp-includes/pluggable.php on line 866
Is it a problem with my theme/template, or is this wordpress having a problem. I've started over 3 times, and the last time, I hardly changed anything in the code, and still get this message.
If anyone had this problem before, please notify me.