Title: [Plugin: Memcached Object Cache] Cannot activate plugin
Last modified: August 19, 2016

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# [Plugin: Memcached Object Cache] Cannot activate plugin

 *  [patforg](https://wordpress.org/support/users/patforg/)
 * (@patforg)
 * [15 years, 2 months ago](https://wordpress.org/support/topic/plugin-memcached-object-cache-cannot-activate-plugin/)
 * Fatal error: Cannot redeclare wp_cache_add() (previously declared in /data/www/
   blog/public/wp-includes/cache.php:24) in /data/www/blog/public/wp-content/plugins/
   memcached/object-cache.php on line 18 Call Stack: 0.0074 687108 1. {main}() /
   data/www/blog/public/wp-admin/plugins.php:0 3.1422 28063492 2. plugin_sandbox_scrape()/
   data/www/blog/public/wp-admin/plugins.php:160

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

 *  [gboudreau](https://wordpress.org/support/users/gboudreau/)
 * (@gboudreau)
 * [15 years ago](https://wordpress.org/support/topic/plugin-memcached-object-cache-cannot-activate-plugin/#post-1898066)
 * I hit the same problem, I found the solution.
    You should not ‘Activate’ that
   plugin. Once you have the plugin installed, you need to copy the wp-content/plugins/
   memcached/object-cache.php file into wp-content/object-cache.php. At that point,
   the memcached server will take over from the standard WP cache mechanism. You
   might need to edit object-cache.php to connect to you memcached server, if different
   than localhost:11211
 *  [Fask](https://wordpress.org/support/users/fask/)
 * (@fask)
 * [14 years, 8 months ago](https://wordpress.org/support/topic/plugin-memcached-object-cache-cannot-activate-plugin/#post-1898096)
 * Hi,
 * so if I understand correctly, you should not install it in wp-content/plugins
   but wp-cotent? confirmed?

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

The topic ‘[Plugin: Memcached Object Cache] Cannot activate plugin’ is closed to
new replies.

 * ![](https://s.w.org/plugins/geopattern-icon/memcached.svg)
 * [Memcached Object Cache](https://wordpress.org/plugins/memcached/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/memcached/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/memcached/)
 * [Active Topics](https://wordpress.org/support/plugin/memcached/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/memcached/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/memcached/reviews/)

 * 2 replies
 * 3 participants
 * Last reply from: [Fask](https://wordpress.org/support/users/fask/)
 * Last activity: [14 years, 8 months ago](https://wordpress.org/support/topic/plugin-memcached-object-cache-cannot-activate-plugin/#post-1898096)
 * Status: not resolved