Title: Fatal Error – could not activate plugin
Last modified: August 21, 2016

---

# Fatal Error – could not activate plugin

 *  [jrundle13](https://wordpress.org/support/users/jrundle13/)
 * (@jrundle13)
 * [12 years, 9 months ago](https://wordpress.org/support/topic/fatal-error-could-not-activate-plugin/)
 * After uploading the plugin and went to activate received this message:
 * Fatal error: Call to undefined function wp_get_active_network_plugins() in /home/
   trishhol/public_html/wp-content/plugins/placester/blueprint/extensions/meta-tags.
   php on line 37
 * It never activated the plugin however, then could not go anywhere and then had
   to delete through ftp.
 * I am in Australia and was wanting to just use the individual property format –
   any suggestions.
 * Thanks
    Janet
 * [http://wordpress.org/plugins/placester/](http://wordpress.org/plugins/placester/)

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

 *  [Matt Williams – Placester Developer Evangelist](https://wordpress.org/support/users/technovangelist/)
 * (@technovangelist)
 * [12 years, 9 months ago](https://wordpress.org/support/topic/fatal-error-could-not-activate-plugin/#post-4118830)
 * Hmmm, so wp_get_active_network_plugins is defined in WordPress core and has nothing
   to do with us. We added the call to that function in a recent update to play 
   better with other plugins. We knew we could rely on this because it was introduced
   in WordPress 3.1.0 in February 2011. I see that your user info shows that you
   are using 3.4.2. Do you perhaps run several instances of WordPress? Is it possible
   that this server is using a version older than 3.1?
 * I just installed WordPress 3.4.2 locally to test this out and the plugin downloaded
   from WP.org worked just fine.
 * Please confirm which version of wordpress you are using for this particular server.
   Also which version of PHP is running? This info will help us solve this issue.
 * thanks
 *  [engmalaa](https://wordpress.org/support/users/engmalaa/)
 * (@engmalaa)
 * [12 years, 1 month ago](https://wordpress.org/support/topic/fatal-error-could-not-activate-plugin/#post-4119034)
 * Hi,
 * After installation, the activation using e-mail is not returning after checking
   and when use API key it gives me an error key while I copied it from the site.
 * Thanks
    Mohammad Alaa

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

The topic ‘Fatal Error – could not activate plugin’ is closed to new replies.

 * ![](https://s.w.org/plugins/geopattern-icon/placester_8d8b8c.svg)
 * [Real Estate Website Builder](https://wordpress.org/plugins/placester/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/placester/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/placester/)
 * [Active Topics](https://wordpress.org/support/plugin/placester/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/placester/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/placester/reviews/)

 * 2 replies
 * 3 participants
 * Last reply from: [engmalaa](https://wordpress.org/support/users/engmalaa/)
 * Last activity: [12 years, 1 month ago](https://wordpress.org/support/topic/fatal-error-could-not-activate-plugin/#post-4119034)
 * Status: not resolved