Title: PHP error
Last modified: August 31, 2016

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# PHP error

 *  [enquirer32](https://wordpress.org/support/users/enquirer32/)
 * (@enquirer32)
 * [10 years, 1 month ago](https://wordpress.org/support/topic/php-error-164/)
 * I am getting a php error:
 * > HP Fatal error: Call to undefined function add_filter() in /mywebsite/wp-content/
   > plugins/knews/knews.php on line 1539
 * What can one do?
 * [https://wordpress.org/plugins/knews/](https://wordpress.org/plugins/knews/)

The topic ‘PHP error’ is closed to new replies.

 * ![](https://s.w.org/plugins/geopattern-icon/knews_c1dde7.svg)
 * [Knews Multilingual Newsletters](https://wordpress.org/plugins/knews/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/knews/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/knews/)
 * [Active Topics](https://wordpress.org/support/plugin/knews/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/knews/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/knews/reviews/)

 * 0 replies
 * 1 participant
 * Last reply from: [enquirer32](https://wordpress.org/support/users/enquirer32/)
 * Last activity: [10 years, 1 month ago](https://wordpress.org/support/topic/php-error-164/)
 * Status: not resolved