[Resolved] Uncaught Error: Class "WPML_Query_Utils" not found

Hi there,

Would you please do three steps below mentioned int he chat?

1. Update WPML to version 4.6.7

- IMPORTANT STEP! Create a backup of your website. Or better approach will be to test this on a copy/staging version of the website to avoid any disruption of a live website.
- Go to "WordPress Dashboard > Plugins > Add new > Commercial (tab)".
- Click the "Check for Updates" button.
- Update WPML and its addons there.

For more information:
https://wpml.org/faq/install-wpml/#automated-updates

2. Increase PHP memory limit

The minimum requirement is 128M but I suggest that you increase it to 512M: https://wpml.org/home/minimum-requirements/

You can add this by adding the code below to "wp-config.php" file of your WordPress installation root folder:

/** Memory Limit */
define('WP_MEMORY_LIMIT', '512M');
define( 'WP_MAX_MEMORY_LIMIT', '512M' );

Please add the code above the line below:

/* That's all, stop editing! Happy blogging. */

3. Check if the issue is happening on a minimal installation or not

- IMPORTANT STEP! Create a backup of your website. Or better approach will be to test this on a copy/staging version of the website to avoid any disruption of a live website.
- Switch to the default theme such as "TwentyTwenty" by going to "WordPress Dashboard > Appearance > themes".
- Go to "WordPress Dashboard > Plugins" and deactivate all plugins except WPML and its add-ons.
- Check if you can still recreate the issue.
- If not, re-activate your plugins one by one and check the issue each time to find out the plugin that causes the problem.

Kindly get back to us with the result of the steps above.

Thanks.