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I have a wordpress blog, which has been compromised multiple times. I have installed SiteLock service to locate the compromised files, but I noticed that it gives me those lines specially in the backend- which is a blank page now-: 

  Warning: Cannot modify header information - headers already sent by (output started at /home/content/31/7838731/html/wp-includes/class-wp-metadata-lazyloader.php:1) in /home/content/31/7838731/html/wp-includes/pluggable.php on line 1171

I have tried looking at the code and it seems like no changes has been added there, and no blank lines in the wp-config neither the wp-settings as I read in some of the sites. What can be the reason for that line? Knowing that it also appears in the blog's main page too but without being blank.

Jonathan Leffler
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Bessa14915
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    I'm voting to close this question as off-topic because op is using this site as a substitute for tech support for a plugin – David May 21 '16 at 01:49
  • Please check if there is any space at the end of functions.php file, some times this will cause this issue. – Mukesh Ram May 21 '16 at 05:59

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