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Problem:
The client is experiencing a fatal error preventing them from editing some translated pages. The error message indicates 'InvalidArgumentException: item should be a Collection or an array or an object' in a specific file within the WPML plugin.

Solution:

Check the Admin profile setup:
- Navigate to Users > Profile and confirm that the First Name and Last Name fields are filled out correctly.
- Go to 'WPML > Translation Management > Translator' and if you have added your profile as a translator, remove it and re-add it. If you haven't configured the Translator yet, you can leave it as is.

If these solutions do not resolve the issue, please open a new support ticket with us for further assistance.