[Resolved] I'm using Learndash plugin on my website but the courses are no longer showing

Hi Arnaud,
Thanks for contacting WPML support, I will be happy to help you today.

In order to investigate this issue I need more details about the following:

1- What changes were made to the site right before the issue starts? Those changes could be anything like (WPML update, other plugins and WordPress core update, or installing new plugins).

2- Please create a full backup and disable the WPML plugin then check if you can see the courses on the front end.

Let me know please how it goes.

Regards,
Mohamed

Hi Arnaud,

1- I couldn't find any similar reported issues or known issues with the LearnDash plugin, it might be a conflict issue between WPML and another plugin. So please check if the issue persists in a minimal environment by following these steps:

- Keep only the WPML plugins and LearnDash and deactivate all the other plugins.
- Switch for a moment to a WordPress default theme like Twenty Twenty-one.
- If the issue is gone, activate one by one to see which one there is causing an interaction issue.

❌ Please backup your database and website before performing the above test ❌

2- Please provide me with the WordPress debug.log, this will allow us to see if any PHP errors are being produced. More Info: https://wordpress.org/support/article/debugging-in-wordpress/

To enable it, open your wp-config.php file and look for:

define('WP_DEBUG', false);

And change it to:

define('WP_DEBUG', true);
// Enable Debug logging to the /wp-content/debug.log file
define('WP_DEBUG_LOG', true);
// Disable display of errors and warnings which is recommended on a live site.
define('WP_DEBUG_DISPLAY', false);
@ini_set('display_errors',0);

Then try to reproduce the issue and check if any errors were saved to the debug.log log file inside the /wp-content/ directory
If you can paste your debug.log to https://pastebin.com/ and provide me that link, it would be great!

Regards,
Mohamed

I checked the debug.log file and I can see the following 2 fatal errors:

This first error is coming from the Jetpack plugin:

[02-Aug-2021 13:25:08 UTC] PHP Fatal error:  Uncaught Error: Class 'Automattic\Jetpack\Sync\WP_Error' not found in xxxxx/wp-content/plugins/jetpack/vendor/automattic/jetpack-sync/src/class-rest-sender.php:37

So please check that error with their support team. The other one is coming from WPML:

[02-Aug-2021 13:26:59 UTC] PHP Fatal error:  Uncaught InvalidArgumentException: element_id and type do not match for element_id:42 the database contains post_attachment while this function was called with post_post in xxxx/wp-content/plugins/sitepress-multilingual-cms/classes/core-abstract-classes/class-wpml-set-language.php:34

This is a common error that can happen when some entries in the database are corrupted, this could be due to a different number of factors like updating or installing new plugins or doing operations on the database.

So please try the following and let me know if it helps:

Go to WPML > Support > Troubleshooting page, then click these options:

- Clear the Cache in WPML
- Remove ghost entries from the translation tables
- Fix element_type collation
- Fix WPML table collation
- Set language information

❌ Please make sure that you have a full database and website backup before trying the above ❌

Regards,
Mohamed