Title: Fatal error
Last modified: August 31, 2016

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# Fatal error

 *  Resolved [radio-birikina](https://wordpress.org/support/users/radio-birikina/)
 * (@radio-birikina)
 * [10 years, 1 month ago](https://wordpress.org/support/topic/fatal-error-2085/)
 * Hi,
    Claudio from Italy. I installed your plug in, but I can’t add any popup 
   because I have this message: Fatal error: Call to undefined function wp_nav_menu_disabled_check()
   in /web/htdocs/www…..it/home/wp-content/plugins/popup-maker/includes/admin/popups/
   post-type-item-metaboxes.php on line 271 Any suggestion? Thanks a lot in advance
   Claudio
 * [https://wordpress.org/plugins/popup-maker/](https://wordpress.org/plugins/popup-maker/)

Viewing 3 replies - 1 through 3 (of 3 total)

 *  Plugin Author [Daniel Iser](https://wordpress.org/support/users/danieliser/)
 * (@danieliser)
 * [10 years, 1 month ago](https://wordpress.org/support/topic/fatal-error-2085/#post-7261461)
 * [@radio-birikina](https://wordpress.org/support/users/radio-birikina/) – That
   would suggest your version of WP is very old, or that there is some type of corruption
   of your WP install. That function was added in WP 3.6, current is 4.4.2.
 * [https://codex.wordpress.org/Function_Reference/wp_nav_menu_disabled_check](https://codex.wordpress.org/Function_Reference/wp_nav_menu_disabled_check)
 * Alternatively there may be some other conflict causing those functions to not
   be loaded properly, but either way signals something isn’t working properly in
   your install.
 * I will also add that in v1.4 which I am working my butt off to get out as soon
   as I can, fingers crossed this week replaces the code that calls that function
   entirely so once that goes out that issue shouldn’t exist for you.
 *  Thread Starter [radio-birikina](https://wordpress.org/support/users/radio-birikina/)
 * (@radio-birikina)
 * [10 years, 1 month ago](https://wordpress.org/support/topic/fatal-error-2085/#post-7261502)
 * Thanks a lot for answer. I know WordPress is not updated but I inherit the website
   and who made it, he blocked the updates…
    It’s not an easy situation I will try
   to solve my problem in another way… Thanks again Claudio
 *  Plugin Author [Daniel Iser](https://wordpress.org/support/users/danieliser/)
 * (@danieliser)
 * [10 years, 1 month ago](https://wordpress.org/support/topic/fatal-error-2085/#post-7261532)
 * [@radio-birikina](https://wordpress.org/support/users/radio-birikina/) – I understand.
   As I said our latest version will not use those functions but will still likely
   require at least WP 3.4 or 3.5. I will have to check.

Viewing 3 replies - 1 through 3 (of 3 total)

The topic ‘Fatal error’ is closed to new replies.

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## Tags

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

 * 3 replies
 * 2 participants
 * Last reply from: [Daniel Iser](https://wordpress.org/support/users/danieliser/)
 * Last activity: [10 years, 1 month ago](https://wordpress.org/support/topic/fatal-error-2085/#post-7261532)
 * Status: resolved