Title: error on activation: N2systembackendInstallController
Last modified: November 4, 2016

---

# error on activation: N2systembackendInstallController

 *  Resolved [dagord](https://wordpress.org/support/users/dagord/)
 * (@dagord)
 * [9 years, 6 months ago](https://wordpress.org/support/topic/error-on-activation-n2systembackendinstallcontroller/)
 * Hello,
    when I try to activate the plugin I get a fatal error message: Fatal 
   error: Class ‘N2systembackendInstallController’ not found in /home2/wcampiog/
   public_html/wp-content/plugins/smart-slider-3/nextend/library/libraries/mvc/application/
   type.php on line 171
 * So, basically, I can’t activate it at all. :-\
 * I’m using WordPress last version (4.6.1) with Optimizer Pro theme.

Viewing 1 replies (of 1 total)

 *  Plugin Support [Gabor](https://wordpress.org/support/users/nextendweb_gabor/)
 * (@nextendweb_gabor)
 * [9 years, 6 months ago](https://wordpress.org/support/topic/error-on-activation-n2systembackendinstallcontroller/#post-8396106)
 * Hi [@dagord](https://wordpress.org/support/users/dagord/)!
 * That class can be found in this file:
    wp-content\plugins\smart-slider-3\nextend\
   library\applications\system\backend\controllers\Install.php so I think it will
   be missing for you, maybe some other files too. I would suggest trying to reinstall
   it using the ftp uploading method: [http://doc.smartslider3.com/article/55-wordpress-installation#ftp](http://doc.smartslider3.com/article/55-wordpress-installation#ftp)
   and if you would use for example Filezilla, you can be sure if all files were
   uploaded or not.
 * If this won’t help either, please contact us at [support@nextendweb.com](https://wordpress.org/support/topic/error-on-activation-n2systembackendinstallcontroller/support@nextendweb.com?output_format=md)

Viewing 1 replies (of 1 total)

The topic ‘error on activation: N2systembackendInstallController’ is closed to new
replies.

 * ![](https://ps.w.org/smart-slider-3/assets/icon.svg?rev=2307688)
 * [Smart Slider 3](https://wordpress.org/plugins/smart-slider-3/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/smart-slider-3/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/smart-slider-3/)
 * [Active Topics](https://wordpress.org/support/plugin/smart-slider-3/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/smart-slider-3/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/smart-slider-3/reviews/)

## Tags

 * [Error Activation](https://wordpress.org/support/topic-tag/error-activation/)

 * 1 reply
 * 2 participants
 * Last reply from: [Gabor](https://wordpress.org/support/users/nextendweb_gabor/)
 * Last activity: [9 years, 6 months ago](https://wordpress.org/support/topic/error-on-activation-n2systembackendinstallcontroller/#post-8396106)
 * Status: resolved