Dealing with WordPress Error: Warning: Cannot modify header information

Headache! Headache! and more headache… that was an hour ago

One of my online from who has a blog that was hosted in my hosting account encountered a problem.

Warning: Cannot modify header information – headers already sent by (output started at //home/htdocs/wordpress/advanced-cache.php:2) in /home/htdocs/wordpress/pluggable.php on line 865

Before I started to work and fix the problem, I managed to have a good coffee and a couple of Marlboro Gold Touch. I know it would be a very tiring fix is waiting ahead of me.

With no idea at all, what causes the problem Mr. Google is the best option to start the fix. And viola! from, I made a lots of reading from comments on the post with regards to the same wordpress issue.

And the most annoying thing comes, only  to find out that white/blank  line/spaces that was appended in the codes of six files that were all from wp-cache plugin folder.


  1. Determine the file that has a error from the displayed error message.
  2. Download the file
  3. Check for empty space before <?php and after ?>
  4. Delete spaces if found
  5. Save the file
  6. Upload the file(make sure to backup the old one)

Hope this might help you when time comes and you found your fingers scratching your head because of the said error.

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Mars Cureg

Web designer by profession, photography hobbyist, T-shirt lover, design blog founder, gamer. Socially and physically awkward, lack of social skills, struggles to communicate with anyone who doesn't have a keyboard. Willing to walk to get to the promised land. Photo and video freelancer, SEO. Check out more on my Google+

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  • tsiremo

    Thanks for your patience, Marlon. I really need this one when encountering this kind of problem. Thanks for the info and effort dude, and can I have one stick of Marlboro Gold Touch or even one puff of it LMAO..

    • That cigarette was so light, you don’t want it

  • melody

    thanks for that information…i also encountered that same problem.