Title: Error when upgrading PHP 8.1
Last modified: September 11, 2023

---

# Error when upgrading PHP 8.1

 *  [tcommerce](https://wordpress.org/support/users/tomscant/)
 * (@tomscant)
 * [2 years, 8 months ago](https://wordpress.org/support/topic/error-when-upgrading-php-8-1/)
 * Hi team, there is a trouble when applying php 8.1 in server.
 * Can anyone help us to solve this? Thanks.
   **This is the error shown in log server:**
 * _[ Mon Sep 11 16:41:45.061160 2023 ] [proxy\_fcgi:error] [pid 1822524] [client
   185.59.51.199:63734] AH01071: Got error ‘PHP message: PHP Fatal error: Uncaught
   TypeError: join(): Argument #2 ($array) must be of type ?array, string given 
   in /hosting/www/website.es/public/wp-content/plugins/colibri-page-builder-pro/
   extend-builder/assets.php:272\nStack trace:\n#0 /hosting/www/website.es/public/
   wp-content/plugins/colibri-page-builder-pro/extend-builder/assets.php(272): join()\
   n#1 /hosting/www/website.es/public/wp-content/plugins/colibri-page-builder-pro/
   extend-builder/assets.php(292): ExtendBuilder\render\_page\_css()\n#2 /hosting/
   www/website.es/public/wp-content/plugins/colibri-page-builder-pro/extend-builder/
   assets.php(314): ExtendBuilder\add\_builder\_css()\n#3 /hosting/www/website.es/
   public/wp-includes/class-wp-hook.php(310): ExtendBuilder\{closure}()\n#4 /hosting/
   www/website.es/public/wp-includes/class-wp-hook.php(334): WP\_Hook->apply\_filters()\
   n#5 /hosting/www/website.es/public/wp-includes/plugin.php(517): WP\_Hook->do\
   _action()\n#6 /hosting/www/website.es/public/wp-includes/script-loader.php(2225):
   do\_…’_
 * Could be the problem here? (attached image)
 * ![](https://i0.wp.com/i.ibb.co/m6sqyS1/Captura-de-pantalla-2023-09-11-a-las-17-
   06-56.png?ssl=1)
    -  This topic was modified 2 years, 8 months ago by [tcommerce](https://wordpress.org/support/users/tomscant/).

Viewing 1 replies (of 1 total)

 *  Plugin Support [cristianbarbu](https://wordpress.org/support/users/cristianbarbu/)
 * (@cristianbarbu)
 * [2 years, 8 months ago](https://wordpress.org/support/topic/error-when-upgrading-php-8-1/#post-17043290)
 * Hello,
 * For support for pro version please contact the author at [support@colibriwp.com](https://wordpress.org/support/topic/error-when-upgrading-php-8-1/support@colibriwp.com?output_format=md)
   or using the site contact form [https://colibriwp.com/#support](https://colibriwp.com/#support)

Viewing 1 replies (of 1 total)

The topic ‘Error when upgrading PHP 8.1’ is closed to new replies.

 * ![](https://ps.w.org/colibri-page-builder/assets/icon-256x256.gif?rev=2748397)
 * [Colibri Page Builder](https://wordpress.org/plugins/colibri-page-builder/)
 * [Support Threads](https://wordpress.org/support/plugin/colibri-page-builder/)
 * [Active Topics](https://wordpress.org/support/plugin/colibri-page-builder/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/colibri-page-builder/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/colibri-page-builder/reviews/)

## Tags

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

 * 1 reply
 * 2 participants
 * Last reply from: [cristianbarbu](https://wordpress.org/support/users/cristianbarbu/)
 * Last activity: [2 years, 8 months ago](https://wordpress.org/support/topic/error-when-upgrading-php-8-1/#post-17043290)
 * Status: not resolved