Title: Getting fatal error after adding another plugin
Last modified: August 21, 2016

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# Getting fatal error after adding another plugin

 *  [Dave_the_Dev](https://wordpress.org/support/users/dave_the_dev/)
 * (@dave_the_dev)
 * [13 years ago](https://wordpress.org/support/topic/getting-fatal-error-after-adding-another-plugin/)
 * I just added the ninja announcements plugin and I got the following error from
   the magento wordpress plugin:
 * Fatal error: Mage_Core_Model_Session_Abstract::getMessages(): The script tried
   to execute a method or access a property of an incomplete object. Please ensure
   that the class definition "Mage_Core_Model_Message_Collection" of the object 
   you are trying to operate on was loaded _before_ unserialize() gets called or
   provide a __autoload() function to load the class definition in [mydomain]\app\
   code\core\Mage\Core\Model\Session\Abstract.php on line 215
 * I’m running wordpress 3.5 and magento 1.7.0.2
 * the magento block code that I’m using (and where the error is appearing) is:
 *     ```
       <?php $nav_block = get_block("catalog.topnav");
       	echo $nav_block; ?>
       ```
   
 * I deactivated the ninja announcements plugin and everything started working again.
   I also had the same problem with the constant contact plugin. Any help would 
   be greatly appreciated!!!!
 * [http://wordpress.org/extend/plugins/magento-wordpress-integration/](http://wordpress.org/extend/plugins/magento-wordpress-integration/)

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## Tags

 * [fatal error](https://wordpress.org/support/topic-tag/fatal-error/)
 * [plugin conflict](https://wordpress.org/support/topic-tag/plugin-conflict/)

 * 0 replies
 * 1 participant
 * Last reply from: [Dave_the_Dev](https://wordpress.org/support/users/dave_the_dev/)
 * Last activity: [13 years ago](https://wordpress.org/support/topic/getting-fatal-error-after-adding-another-plugin/)
 * Status: not resolved