Title: Problem after installing the plugin
Last modified: August 20, 2016

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# Problem after installing the plugin

 *  [kosaks](https://wordpress.org/support/users/kosaks/)
 * (@kosaks)
 * [14 years, 4 months ago](https://wordpress.org/support/topic/problem-after-installing-the-plugin/)
 * Hello to all
 * I have a problem on my wordpress site.. After i install the plugin w3 total cache
   my wordpress site encountered a problem. the problem says
 * > Fatal error: Call to undefined method stdClass::set_prefix() in /home/www/alpha-
   > mobile-marketing.com/wp-includes/load.php on line 337
 * Can someone help me on how can i solve this problem? i’ve been searching for 
   the solution on the problem but none of them works. Please help my guys..
 * thanks in advance

The topic ‘Problem after installing the plugin’ is closed to new replies.

## Tags

 * [WordPress Error](https://wordpress.org/support/topic-tag/wordpress-error/)
 * [wordpress fatal error](https://wordpress.org/support/topic-tag/wordpress-fatal-error/)
 * [wordpress plugins](https://wordpress.org/support/topic-tag/wordpress-plugins/)

 * 0 replies
 * 1 participant
 * Last reply from: [kosaks](https://wordpress.org/support/users/kosaks/)
 * Last activity: [14 years, 4 months ago](https://wordpress.org/support/topic/problem-after-installing-the-plugin/)
 * Status: not resolved

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