Problem: The client was unable to translate some custom added post types. Clicking the '+' to add translations loaded a blank page, with Safari reporting 'Safari can’t open the page' and Chrome showing an 'ERR_EMPTY_RESPONSE' error. Solution: 1. We installed the WPML SEO addon plugin to ensure compatibility. 2. We disabled and then re-enabled the Yoast SEO and Yoast Duplicate plugins. 3. We cleared the WPML cache. Additionally, we noted that some errors might be related to the use of PHP 8.2.6, which isn't fully compatible with WordPress. We recommend checking the compatible PHP versions with WordPress here: WordPress and PHP Compatibility.
If this solution doesn't look relevant, please open a new support ticket in the WPML support forum.
