Title: Error message
Last modified: November 13, 2018

---

# Error message

 *  Resolved [tahoemnts](https://wordpress.org/support/users/tahoemnts/)
 * (@tahoemnts)
 * [7 years, 6 months ago](https://wordpress.org/support/topic/error-message-724/)
 * What does this mean when activating SSL with plugin:
    Fatal error: Call to a 
   member function flush_rules() on null in /home/pastrell/public_html/wp-includes/
   rewrite.php on line 273

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

 *  Plugin Contributor [Rogier Lankhorst](https://wordpress.org/support/users/rogierlankhorst/)
 * (@rogierlankhorst)
 * [7 years, 6 months ago](https://wordpress.org/support/topic/error-message-724/#post-10877309)
 * Really Simple SSL will try to flush the rewrite rules, because the domain has
   changed from http to https. This will prevent your site from showing 404 errors
   after the switch.
 * It seems that in some cases, either due to memory issues or a conflicting flush
   rule, this error can pop up. It will go away on refresh as this action will only
   execute once, and your site is switched to https.
 * If the error prevents the activation from completing (which is the case if the
   activate SSL notice does not go away), you can use the force activation method
   to bypass the activation procedure, by adding this to your wp-config.php:
    define(“
   RSSSL_FORCE_ACTIVATE”, true);
 * There are safeguards to prevent this from happening, but apparently there are
   still some configurations in which this can occur.
 * Let me know if this helps!
 *  Thread Starter [tahoemnts](https://wordpress.org/support/users/tahoemnts/)
 * (@tahoemnts)
 * [7 years, 6 months ago](https://wordpress.org/support/topic/error-message-724/#post-10880757)
 * Thanks. I did this and worked:
    [https://hostingxp.com/fix-fatal-error-call-to-a-member-function-flush_rules/](https://hostingxp.com/fix-fatal-error-call-to-a-member-function-flush_rules/)

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

The topic ‘Error message’ is closed to new replies.

 * ![](https://ps.w.org/really-simple-ssl/assets/icon-256x256.png?rev=2839720)
 * [Really Simple Security - Simple and Performant Security (formerly Really Simple SSL)](https://wordpress.org/plugins/really-simple-ssl/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/really-simple-ssl/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/really-simple-ssl/)
 * [Active Topics](https://wordpress.org/support/plugin/really-simple-ssl/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/really-simple-ssl/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/really-simple-ssl/reviews/)

 * 2 replies
 * 2 participants
 * Last reply from: [tahoemnts](https://wordpress.org/support/users/tahoemnts/)
 * Last activity: [7 years, 6 months ago](https://wordpress.org/support/topic/error-message-724/#post-10880757)
 * Status: resolved