Title: Fatal error after installing plugin
Last modified: March 31, 2019

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# Fatal error after installing plugin

 *  Resolved [crnewbold](https://wordpress.org/support/users/crnewbold/)
 * (@crnewbold)
 * [7 years, 2 months ago](https://wordpress.org/support/topic/fatal-error-after-installing-plugin-7/)
 * I am unable to use my wordpress install after installing this plugin. I am getting
   the error “Fatal error: Call to undefined function get_networks() in /public_html/
   wp-content/plugins/really-simple-ssl/class-multisite.php on line 990”

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

 *  Plugin Contributor [Rogier Lankhorst](https://wordpress.org/support/users/rogierlankhorst/)
 * (@rogierlankhorst)
 * [7 years, 2 months ago](https://wordpress.org/support/topic/fatal-error-after-installing-plugin-7/#post-11376696)
 * This function is introduced with WordPress 4.6. We’ve been trying to keep Really
   Simple SSL backward compatible up to 4.2, but we have missed this function in
   that regard.
 * We’ll look into this. For now, if you can upgrade to WP 4.6, this should resolve
   the issue. To regain access to your site you can rename the Really Simple SSL
   plugin folder, then you can upgrade your wordpress, if that is an option for 
   you.
 *  Thread Starter [crnewbold](https://wordpress.org/support/users/crnewbold/)
 * (@crnewbold)
 * [7 years, 2 months ago](https://wordpress.org/support/topic/fatal-error-after-installing-plugin-7/#post-11377125)
 * Great, thanks! I went ahead and updated.

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

The topic ‘Fatal error after installing plugin’ 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: [crnewbold](https://wordpress.org/support/users/crnewbold/)
 * Last activity: [7 years, 2 months ago](https://wordpress.org/support/topic/fatal-error-after-installing-plugin-7/#post-11377125)
 * Status: resolved