Title: Update Failed: Controller not found: N2systembackendInstallController
Last modified: June 7, 2018

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# Update Failed: Controller not found: N2systembackendInstallController

 *  ResolvedPlugin Author [Nextendweb](https://wordpress.org/support/users/nextendweb/)
 * (@nextendweb)
 * [7 years, 11 months ago](https://wordpress.org/support/topic/update-failed-controller-not-found-n2systembackendinstallcontroller/)
 * When you upgrade to Smart Slider 3.3 from 3.2 you might see the following error
   message:
 * `Update Failed: Controller not found: N2systembackendInstallController`
 * You can dismiss it, just refresh the page and everything should work as expected.
    -  This topic was modified 7 years, 11 months ago by [Nextendweb](https://wordpress.org/support/users/nextendweb/).

Viewing 7 replies - 1 through 7 (of 7 total)

 *  [zimbo000](https://wordpress.org/support/users/zimbo000/)
 * (@zimbo000)
 * [7 years, 11 months ago](https://wordpress.org/support/topic/update-failed-controller-not-found-n2systembackendinstallcontroller/#post-10374318)
 * Not so sure… the slider does work but Chrome Dev Tools reports
 * `(index):417 Uncaught ReferenceError: N2R is not defined at (index):417`
 * Cleared the Console, forced a hard cache refresh and the error keeps appearing
 * This was the full error message after the update to 3.3:
 *     ```
       Controller not found: N2systembackendInstallController
       Fatal error: Uncaught Error: Call to undefined method N2Form::import() in /www/sites/fd7/491/dev.henleyherald.com/web/wp-content/plugins/smart-slider-3/library/smartslider/backend/N2SmartsliderApplicationTypeBackend.php:16 Stack trace: #0 /www/sites/fd7/491/dev.henleyherald.com/web/wp-content/plugins/smart-slider-3/nextend/library/libraries/mvc/application/type.php(50): N2SmartsliderApplicationTypeBackend->autoload() #1 /www/sites/fd7/491/dev.henleyherald.com/web/wp-content/plugins/smart-slider-3/nextend/library/libraries/mvc/application/application.php(61): N2ApplicationType->__construct(Object(N2SmartSliderApplication), '/www/sites/fd7/...') #2 /www/sites/fd7/491/dev.henleyherald.com/web/wp-content/plugins/smart-slider-3/nextend/library/libraries/mvc/application/application.php(85): N2Application->_createApplicationType('backend') #3 /www/sites/fd7/491/dev.henleyherald.com/web/wp-content/plugins/smart-slider-3/includes/smartslider3.php(259): N2Application->getApplicationType('backend') #4 /www/sites/fd7/491/dev.henleyhe in /www/sites/fd7/491/dev.henleyherald.com/web/wp-content/plugins/smart-slider-3/library/smartslider/backend/N2SmartsliderApplicationTypeBackend.php on line 16
       ```
   
 *  Plugin Support [Gabor](https://wordpress.org/support/users/nextendweb_gabor/)
 * (@nextendweb_gabor)
 * [7 years, 11 months ago](https://wordpress.org/support/topic/update-failed-controller-not-found-n2systembackendinstallcontroller/#post-10374349)
 * Hi [@zimbo000](https://wordpress.org/support/users/zimbo000/)!
 * I think in your case some files might be missing. Please follow this alternative
   update method:
    [https://smartslider3.helpscoutdocs.com/article/418-wordpress-alternative-update#ftp](https://smartslider3.helpscoutdocs.com/article/418-wordpress-alternative-update#ftp)
   so go to your Plugins list, delete your current Smart Slider 3 installation, 
   then upload our zip files through FTP instead. If you would use Filezilla, you
   could make sure that all the files are getting uploaded.
 * If this won’t solve your problem, please write to us to [support@nextendweb.com](https://wordpress.org/support/topic/update-failed-controller-not-found-n2systembackendinstallcontroller/support@nextendweb.com?output_format=md)
   and we will try to help there!
 *  [zimbo000](https://wordpress.org/support/users/zimbo000/)
 * (@zimbo000)
 * [7 years, 11 months ago](https://wordpress.org/support/topic/update-failed-controller-not-found-n2systembackendinstallcontroller/#post-10374370)
 * Just found that the thumbnails under the main image are displaying in a vertical
   column and not horizontally under the image as before. I post this in case anyone
   else sees an issue.
 * I’ll try your update method and report back.
 *  Plugin Author [Nextendweb](https://wordpress.org/support/users/nextendweb/)
 * (@nextendweb)
 * [7 years, 11 months ago](https://wordpress.org/support/topic/update-failed-controller-not-found-n2systembackendinstallcontroller/#post-10374404)
 * Just pushed out version 3.3.2 which should solve the “Controller not found: N2systembackendInstallController”
   error. For the other problems, please get in touch with us with a link to your
   site: [support@nextendweb.com](https://wordpress.org/support/topic/update-failed-controller-not-found-n2systembackendinstallcontroller/support@nextendweb.com?output_format=md)
 *  [djolbars](https://wordpress.org/support/users/djolbars/)
 * (@djolbars)
 * [7 years, 11 months ago](https://wordpress.org/support/topic/update-failed-controller-not-found-n2systembackendinstallcontroller/#post-10374434)
 * Similar problem and it cause conflict with tinyMCE Advanced too …
 * upd…
 * alternative update method does not solve problem with TinyMCE
    -  This reply was modified 7 years, 11 months ago by [djolbars](https://wordpress.org/support/users/djolbars/).
 *  [zimbo000](https://wordpress.org/support/users/zimbo000/)
 * (@zimbo000)
 * [7 years, 11 months ago](https://wordpress.org/support/topic/update-failed-controller-not-found-n2systembackendinstallcontroller/#post-10374463)
 * Just done the update to 3.3.1 as per the instructions via FTP. N2R error has 
   not gone away.
 * Updated to 3.3.2, N2R error still there plus thumbnails still vertical. Will 
   send email with site details.
 *  Plugin Author [Nextendweb](https://wordpress.org/support/users/nextendweb/)
 * (@nextendweb)
 * [7 years, 11 months ago](https://wordpress.org/support/topic/update-failed-controller-not-found-n2systembackendinstallcontroller/#post-10374528)
 * Version 3.3.3 should fix TinyMCE advanced plugin issue, thanks for reporting 
   [@djolbars](https://wordpress.org/support/users/djolbars/)
 * [@zimbo000](https://wordpress.org/support/users/zimbo000/): none of these updates
   will solve your issue, we can continue the discussion about your issue in email.
   We have just sent you the reply.

Viewing 7 replies - 1 through 7 (of 7 total)

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 * 7 replies
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 * Last reply from: [Nextendweb](https://wordpress.org/support/users/nextendweb/)
 * Last activity: [7 years, 11 months ago](https://wordpress.org/support/topic/update-failed-controller-not-found-n2systembackendinstallcontroller/#post-10374528)
 * Status: resolved