Hello,
If there are no user in Joomla user table with the user ID used importing articles then you see this error. To solve this first export and import Joomla users from Joomla 3 site to Joomla 4 site and then do the export/import of Joomla articles. Also export Joomla user table
id field and Set Keep user ID to Yes in Joomla user import template. That way same user ids are migrated from Joomla 3 to Joomla 4.
You can use
Migration templates which comes with RO CSVI which comes with all these settings.
Kind regards,
Tharuna
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