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Hello!
That error is a database + server issue, almost all the time it's because the database is missing the right configuration in the tables.
Please ask your hosting about this and ask them if they can check that all the tables have auto increment where "ID" elements exist but in general to check the database (logs) they might have in the server.
Thank you for the updates. Happy to know you are getting the expected results now. Please feel free to ping us if you need any further assistance with WPML. We are happy to help always.