Problem: The client is trying to add new languages to their WPML setup but encounters an error stating to fill out all required fields, despite all fields being filled. Solution: 1. We recommend updating WPML to the latest version and ensuring all other plugins are updated as well.
2. If the issue persists, follow the steps provided in a related support ticket.
3. Increase the PHP 'max_input_vars' limit to 3000 by adding the following code to your wp-config.php:
@ini_set( 'max_input_vars' , 3000 );
If these steps do not resolve the issue, or if the solution seems outdated or irrelevant to your case, please open a new support ticket. We highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. For further assistance, visit our support forum at https://wpml.org/forums/.