Unfortunately our support here on the forum is quite limited. Here we cannot request access to your website to investigate the problem, and we may need this to debug. In the WPML forum we have more tools to help you.
Could you please check if WPML, WCML and WordPress are updated to the latest version?
If so, and the issue persist, please enable WP_Debug, WP_Debug_log and WP_Debug_Display on your website, it will display more details about the error: https://wpml.org/documentation/support/debugging-wpml/
After that, please reproduce the error and check if it displays a error message. If so, please send us a screenshot of the error. Please also check if there are any errors on the debug.log file (located on the wp-content folder).
Please also check if the issue still happens in a minimal install (default theme + only WPML, Woocommerce and WCML enabled).
Also, could you send us the links of this other forum, of users with the same problem? This can be useful.