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Problem:
The client encountered a fatal error in the 'translate custom fields' section within 'WPML > Settings'. The error prevented rendering of sections below it and was resolved by disabling the 'Advanced Custom Fields Multilingual' plugin.
Solution:
We are aware of this issue and our developers are currently working on a fix. In the meantime, we recommend following the workaround provided in our errata page: https://wpml.org/errata/fatal-error-uncaught-invalidargumentexception-item-should-be-a-collection-or-an-array-or-an-object-when-visiting-wpml-settings/.

Please note that this solution may become outdated or might not apply to your case. If the issue persists, we encourage you to open a new support ticket. We also 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.