Title: Error activating plugin
Last modified: February 13, 2019

---

# Error activating plugin

 *  Resolved [Andrea](https://wordpress.org/support/users/isifacile/)
 * (@isifacile)
 * [7 years, 3 months ago](https://wordpress.org/support/topic/error-activating-plugin-42/)
 * Hi,
 * when I try to activate the plugin have this error:
 * Fatal error: Cannot redeclare wp_cache_add() (previously declared in /home/ss82p6h0/
   public_html/wp-includes/cache.php:27) in /home/ss82p6h0/public_html/wp-content/
   plugins/memcached-redux/object-cache.php on line 18
 * Thanks,
    Andrea
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Ferror-activating-plugin-42%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

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

 *  Plugin Contributor [Ipstenu (Mika Epstein)](https://wordpress.org/support/users/ipstenu/)
 * (@ipstenu)
 * 🏳️‍🌈 Advisor and Activist
 * [7 years, 3 months ago](https://wordpress.org/support/topic/error-activating-plugin-42/#post-11203780)
 * It’s not meant to be activated like a traditional plugin.
 * Please review [https://wordpress.org/plugins/memcached-redux/#installation](https://wordpress.org/plugins/memcached-redux/#installation)
 *  Thread Starter [Andrea](https://wordpress.org/support/users/isifacile/)
 * (@isifacile)
 * [7 years, 3 months ago](https://wordpress.org/support/topic/error-activating-plugin-42/#post-11207656)
 * Oops 🙂
 * Thanks!

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

The topic ‘Error activating plugin’ is closed to new replies.

 * ![](https://s.w.org/plugins/geopattern-icon/memcached-redux_98a1ab.svg)
 * [Memcached Redux](https://wordpress.org/plugins/memcached-redux/)
 * [Support Threads](https://wordpress.org/support/plugin/memcached-redux/)
 * [Active Topics](https://wordpress.org/support/plugin/memcached-redux/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/memcached-redux/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/memcached-redux/reviews/)

 * 2 replies
 * 2 participants
 * Last reply from: [Andrea](https://wordpress.org/support/users/isifacile/)
 * Last activity: [7 years, 3 months ago](https://wordpress.org/support/topic/error-activating-plugin-42/#post-11207656)
 * Status: resolved