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1. removing
   Member
   Posted 4 months ago #

   I get the following error every-time I upload an image using the upload/insert.

   Fatal error: Call to undefined function get_post_thumbnail_id() in /homepages/31/d379303097/htdocs/wp-rmminc/wp-admin/includes/media.php on line 1173. The same error if I click on the gallery

2. t-p
   Member
   Posted 4 months ago #

   see if this thread helps: http://wordpress.org/support/topic/fatal-error-call-to-undefined-function-get_post_thumbnail_id-in

3. removing
   Member
   Posted 4 months ago #

   No this didn't help.

4. esmi
   Theme Diva & Forum Moderator
   Posted 4 months ago #

   Try:
   - switching to the Twenty Eleven theme by renaming your current theme's folder in wp-content/themes and adding "-old" to the end of the folder name using FTP or whatever file management application your host provides.

   - resetting the plugins folder by FTP or phpMyAdmin.

   - re-uploading all files & folders - except the wp-content folder - from a fresh download of WordPress.

   - re-running the upgrade via wp-admin/upgrade.php

5. removing
   Member
   Posted 4 months ago #

   No this didn't help.

6. pedrogas_g
   Member
   Posted 3 months ago #

   Hi
   this problem is a theme probleme
   in your functions.php cut all the
   

   add_theme_support( 'post-thumbnails' );

   and paste all of them to the end of the file.

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