Title: [Plugin:Wp-dtree] Cannot modify headers error
Last modified: August 19, 2016

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# [Plugin:Wp-dtree] Cannot modify headers error

 *  [tcovey](https://wordpress.org/support/users/tcovey/)
 * (@tcovey)
 * [17 years, 4 months ago](https://wordpress.org/support/topic/plugin-wp-dtree-pluginwp-dtree-cannot-modify-headers-error/)
 * I’ve just moved my wordpress site to a new provider. Most everything is working
   properly, however, when I try and save or update a post/page I get this error:
 * WordPress database error: [Query was empty]
 * Warning: Cannot modify header information – headers already sent by (output started
   at /home/xxxxxx/public_html/wp-includes/wp-db.php:517) in /home/xxxxx/public_html/
   wp-includes/pluggable.php on line 850
 * If I disable wp-dtree everything works fine (the post actually does save even
   with the error, but it ain’t pretty).
 * Wp-dtree itself actually works just fine as well (I’ve also verified the wp_dtree_cache
   table is present and that the related rows exist in wp_options).
 * Any ideas how to fix the errors?
 * Thanks,
    Tony

The topic ‘[Plugin:Wp-dtree] Cannot modify headers error’ is closed to new replies.

## Tags

 * [WP-dTree 3.0](https://wordpress.org/support/topic-tag/wp-dtree-3-0/)

 * 0 replies
 * 1 participant
 * Last reply from: [tcovey](https://wordpress.org/support/users/tcovey/)
 * Last activity: [17 years, 4 months ago](https://wordpress.org/support/topic/plugin-wp-dtree-pluginwp-dtree-cannot-modify-headers-error/)
 * Status: not resolved

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