Title: Cannot modify header information
Last modified: October 25, 2019

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# Cannot modify header information

 *  Resolved [turmapo](https://wordpress.org/support/users/turmapo/)
 * (@turmapo)
 * [6 years, 6 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-152/)
 * Hello,
 * every single time I want to run a schedule i recieve this info and fields in 
   WP are not updated (values exists in SF)
 * Warning: Cannot modify header information – headers already sent by (output started
   at /wp-admin/includes/template.php:2340) in /wp-includes/pluggable.php on line
   1251
 * Warning: Cannot modify header information – headers already sent by (output started
   at /wp-admin/includes/template.php:2340) in /wp-includes/pluggable.php on line
   1254
 * Is there something that I am doing wrong?
 * fields seems to be mapped correctly
    -  This topic was modified 6 years, 6 months ago by [turmapo](https://wordpress.org/support/users/turmapo/).

Viewing 3 replies - 1 through 3 (of 3 total)

 *  Plugin Author [Jonathan Stegall](https://wordpress.org/support/users/jonathanstegall/)
 * (@jonathanstegall)
 * [6 years, 6 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-152/#post-12065272)
 * [@turmapo](https://wordpress.org/support/users/turmapo/) I haven’t seen that 
   one before. What versions of PHP and WordPress are you running? Have you tried
   deactivating other plugins you might be running? The scheduling library in this
   plugin is action-scheduler, which is made by the WooCommerce folks. I don’t know
   off the top of my head what its system requirements are.
 *  Thread Starter [turmapo](https://wordpress.org/support/users/turmapo/)
 * (@turmapo)
 * [6 years, 6 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-152/#post-12065289)
 * I am using clean WP instance (no other plugins installed)
    newest one up-to-date(
   5.2.4)
 * PHP 7.2.14
 * mapping fields:
    SF product name (in one of tables) -> post_title (sync) SF product
   price (in same item) -> post_content (SF -> WP)
 * want to pull prices (from SF) to items that are created in WP
 *  Plugin Author [Jonathan Stegall](https://wordpress.org/support/users/jonathanstegall/)
 * (@jonathanstegall)
 * [6 years, 6 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-152/#post-12133069)
 * [@turmapo](https://wordpress.org/support/users/turmapo/) sorry for delay here.
   I’m curious what theme you are using. This plugin doesn’t generate any output,
   at least not intentionally. It may be theme related.
 * I’m also curious if your site is having cron issues. You may want to install 
   the [WP Crontrol](https://wordpress.org/plugins/wp-crontrol/) plugin and see 
   if the tasks are running as they should.
 * If you are using a clean default WP theme, and if cron is running as it should,
   you may next want to see if you can log the variables that WordPress is trying
   to use in /wp-includes/pluggable.php at line 1251 and 1254.
 * Without being able to reproduce the issue though, I can’t really offer much advice
   beyond that.

Viewing 3 replies - 1 through 3 (of 3 total)

The topic ‘Cannot modify header information’ is closed to new replies.

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 * 3 replies
 * 1 participant
 * Last reply from: [Jonathan Stegall](https://wordpress.org/support/users/jonathanstegall/)
 * Last activity: [6 years, 6 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-152/#post-12133069)
 * Status: resolved