Title: function not found
Last modified: January 27, 2022

---

# function not found

 *  Resolved [miko1997](https://wordpress.org/support/users/miko1997/)
 * (@miko1997)
 * [4 years, 4 months ago](https://wordpress.org/support/topic/function-not-found-3/)
 * arrayy() expects parameter 1 to be a valid callback, function ‘_disable_block_editor_for_navigation_post_type’
   not found or invalid function name in /home/edivtcom/public_html/doctors/wp-includes/
   class-wp-hook.php on line 307

Viewing 6 replies - 1 through 6 (of 6 total)

 *  [davidsol](https://wordpress.org/support/users/davidsol/)
 * (@davidsol)
 * [4 years, 4 months ago](https://wordpress.org/support/topic/function-not-found-3/#post-15298703)
 *     ```
       Got a certainty in disabling the Gutenberg editor while, file =>/classes/Course_Settings_Tabs.php
   
       line 16 :
        $isGutenberg = 0;//apply_filters('use_block_editor_for_post_type', true, 'courses');
   
       while the developers give us an update
       ```
   
 * I hope it helps someone.
 *  Thread Starter [miko1997](https://wordpress.org/support/users/miko1997/)
 * (@miko1997)
 * [4 years, 4 months ago](https://wordpress.org/support/topic/function-not-found-3/#post-15299255)
 * thank you so much
 *  [justme](https://wordpress.org/support/users/funtrick/)
 * (@funtrick)
 * [4 years, 4 months ago](https://wordpress.org/support/topic/function-not-found-3/#post-15300696)
 * > `Got a certainty in disabling the Gutenberg editor while, file =>/classes/Course_Settings_Tabs.
   > php
   > line 16 :
   >  $isGutenberg = 0;//apply_filters(‘use_block_editor_for_post_type’,
   > true, ‘courses’);
   > while the developers give us an update`
 * I tried this but it didn’t work for me though.
 *  [jurgendv](https://wordpress.org/support/users/jurgendv/)
 * (@jurgendv)
 * [4 years, 4 months ago](https://wordpress.org/support/topic/function-not-found-3/#post-15300888)
 * Thank you, it works for me!
 *  [trikop](https://wordpress.org/support/users/trikop/)
 * (@trikop)
 * [4 years, 4 months ago](https://wordpress.org/support/topic/function-not-found-3/#post-15301394)
 * Thanks! Works for me too!
 *  [Pawa Tecnologia](https://wordpress.org/support/users/pawatecnologia/)
 * (@pawatecnologia)
 * [4 years, 3 months ago](https://wordpress.org/support/topic/function-not-found-3/#post-15316143)
 * It works in part! The error message in the log is gone. But the site is slow 
   at times… it takes too long to respond or it takes too long to save something
   in the database.
 * I have other sites on the same server that are not slow. Only difference is that
   they don’t have the tutor installed.

Viewing 6 replies - 1 through 6 (of 6 total)

The topic ‘function not found’ is closed to new replies.

 * ![](https://ps.w.org/tutor/assets/icon-256x256.gif?rev=3193875)
 * [Tutor LMS - eLearning and online course solution](https://wordpress.org/plugins/tutor/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/tutor/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/tutor/)
 * [Active Topics](https://wordpress.org/support/plugin/tutor/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/tutor/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/tutor/reviews/)

 * 6 replies
 * 6 participants
 * Last reply from: [Pawa Tecnologia](https://wordpress.org/support/users/pawatecnologia/)
 * Last activity: [4 years, 3 months ago](https://wordpress.org/support/topic/function-not-found-3/#post-15316143)
 * Status: resolved