Title: Error: headers already sent by..
Last modified: June 6, 2018

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# Error: headers already sent by..

 *  Resolved [Tanner](https://wordpress.org/support/users/tannerchung/)
 * (@tannerchung)
 * [7 years, 11 months ago](https://wordpress.org/support/topic/error-headers-already-sent-by/)
 * Got these errors when activating the plugin:
 * Strict Standards: Static function ILAB\MediaCloud\Tasks\BackgroundProcess::cancelAll()
   should not be abstract in ../wp-content/plugins/ilab-media-tools/classes/Tasks/
   BackgroundProcess.php on line 526
 * Warning: Cannot modify header information – headers already sent by (output started
   at ../wp-content/plugins/ilab-media-tools/classes/Tasks/BackgroundProcess.php:
   526) in ../wp-admin/includes/misc.php on line 1116

Viewing 2 replies - 1 through 2 (of 2 total)

 *  Plugin Author [interfacelab](https://wordpress.org/support/users/interfacelab/)
 * (@interfacelab)
 * [7 years, 6 months ago](https://wordpress.org/support/topic/error-headers-already-sent-by/#post-10845157)
 * You are using PHP 5.6. (Or were using).
 * You should upgrade to 7.x as 5.6 is being EOL’d next month.
 *  Thread Starter [Tanner](https://wordpress.org/support/users/tannerchung/)
 * (@tannerchung)
 * [7 years, 6 months ago](https://wordpress.org/support/topic/error-headers-already-sent-by/#post-10846674)
 * Huh that’s weird. I’ve always been using 7.2

Viewing 2 replies - 1 through 2 (of 2 total)

The topic ‘Error: headers already sent by..’ is closed to new replies.

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 * 2 replies
 * 2 participants
 * Last reply from: [Tanner](https://wordpress.org/support/users/tannerchung/)
 * Last activity: [7 years, 6 months ago](https://wordpress.org/support/topic/error-headers-already-sent-by/#post-10846674)
 * Status: resolved