Problem: If you're experiencing a PHP Fatal error with the message 'Uncaught TypeError: md5(): Argument #1 ($string) must be of type string, array given' in Advanced Custom Fields Multilingual, particularly in the context of repeater fields or checkbox fields, this might be due to incorrect field settings in your WPML configuration. Solution: We recommend checking your field group settings, especially if you have Post Object Fields set to 'Translate' and a Repeater set to 'Not translate'. Changing these fields to 'Copy' or 'Copy once' could resolve the issue. This adjustment allows you to save the options page without errors. For detailed guidance on setting field translation preferences, please visit Recommended Custom Fields Translation Preferences for ACF and WPML.
Please note that this solution might be irrelevant if it's outdated or not applicable to your specific case. 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. If the problem persists, please open a new support ticket for further assistance.
