Title: Installing new theme breaks WordPress
Last modified: November 23, 2023

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# Installing new theme breaks WordPress

 *  [asamshah](https://wordpress.org/support/users/asamshah/)
 * (@asamshah)
 * [2 years, 6 months ago](https://wordpress.org/support/topic/installing-new-theme-breaks-wordpress/)
 * I updated WordPress to version 6.4.1 and installed a new theme. Unfortunately,
   it has broken WP and comes up with the following below error message. 
   Im running
   the site locally using localwp, which also has been updated to the latest version
   as well.
 * 
   Can anyone help how to fix this?
 * **Fatal error**: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback)
   must be a valid callback, function “save_heystudio_news_fields” not found or 
   invalid function name in /Users/user/Local Sites/asamone/app/public/wp-includes/
   class-wp-hook.php:324 Stack trace: #0 /Users/user/Local Sites/asamone/app/public/
   wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array) #1 /Users/
   user/Local Sites/asamone/app/public/wp-includes/plugin.php(517): WP_Hook->do_action(
   Array) #2 /Users/user/Local Sites/asamone/app/public/wp-admin/admin.php(175):
   do_action(‘admin_init’) #3 /Users/user/Local Sites/asamone/app/public/wp-admin/
   index.php(10): require_once(‘/Users/user/Loc…’) #4 {main} thrown in **/Users/
   user/Local Sites/asamone/app/public/wp-includes/class-wp-hook.php** on line **
   324**
 * There has been a critical error on this website. Please check your site admin
   email inbox for instructions.

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

 *  [Carlos Bravo](https://wordpress.org/support/users/cbravobernal/)
 * (@cbravobernal)
 * [2 years, 6 months ago](https://wordpress.org/support/topic/installing-new-theme-breaks-wordpress/#post-17225242)
 * Hi there!
 * A quick fix to prevent the fatal error is going to `wp-content/themes/heystudio/
   custom-fields.php` and comment line 390, which is the root cause.
 * The code responsible of crashing the site is:
 * `add_action('admin_init', 'save_heystudio_news_fields');`
 * It seems that the function `save_heystudio_news_fields` is not defined in any
   part of the theme code.
 * I’ve also seen some warnings when activating the theme, so it may need some more
   tweaks.
   The best option is still to contact the theme provider (the site where
   you downloaded it) and let them know that the theme is crashing the site in WP
   6.4!
 * Hope it helps!
    -  This reply was modified 2 years, 6 months ago by [Carlos Bravo](https://wordpress.org/support/users/cbravobernal/).
 *  [Sania Mohammadi](https://wordpress.org/support/users/saniamohammadi/)
 * (@saniamohammadi)
 * [2 years, 6 months ago](https://wordpress.org/support/topic/installing-new-theme-breaks-wordpress/#post-17225247)
 * Hi [@asamshah](https://wordpress.org/support/users/asamshah/),
 * Please try the following steps:
    1. Make sure the installed theme is compatible with WordPress version 6.4.1. You
       can also contact the theme developer or check their documentation for any updates.
    2. Deactivate the new theme by renaming its folder in the “wp-content/themes” directory
       in these steps:
        – Using localwp or via [FTP](https://wordpress.org/documentation/article/ftp-clients/),
       access your WordPress installation – Navigate to the “wp-content/themes” directory–
       Rename the folder of the newly installed theme. This will deactivate the theme
       and allow you to access your website._Just remember to always back up your website
       before making any changes._
    3. If you have a backup of your website before the update, restore it to get back
       to the previous working state.
    4. You can also check error logs in your localwp environment for more details.
 * After all, the best thing to do here is to contact the theme support team and
   let them about the issue.
 *  Moderator [t-p](https://wordpress.org/support/users/t-p/)
 * (@t-p)
 * [2 years, 6 months ago](https://wordpress.org/support/topic/installing-new-theme-breaks-wordpress/#post-17225316)
 * What theme are you using?
 * Theme acquired from?

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

The topic ‘Installing new theme breaks WordPress’ is closed to new replies.

## Tags

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

 * In: [Fixing WordPress](https://wordpress.org/support/forum/how-to-and-troubleshooting/)
 * 3 replies
 * 4 participants
 * Last reply from: [t-p](https://wordpress.org/support/users/t-p/)
 * Last activity: [2 years, 6 months ago](https://wordpress.org/support/topic/installing-new-theme-breaks-wordpress/#post-17225316)
 * Status: not resolved

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