I intend to relaunch a multilingual website with around 700 articles (3 languages).
To get rid of many years of plugins and obsolete template engines we decided to start from scratch with a clean J4 installation migrating articles with RO CSVI.
Going through your tutorials I believe it is all set up right and I´m trying as a first start to migrate just Joomla Field Groups). Which already doesn´t work

Export in J3 is working fine!
Import is set up properly and I see a correct preview.
BUT THEN....
I´m getting a Popup window stating:
An error has occured during the import. Below the information received from the server.
Status error: 200
Status message: OK
Done. No further action. No Import. (By the way: Typo in occurred)
Now the info provided doesn´t really help. Log files on the server only show debug messages and no Errors.
I´m new to this tool and it might be a simple solution, but I just couldn´t fin it so far.
So really hope you can help as I´m pretty anxious to have import 700 articles by copy & paste

Basics:
Joomla 4.1.5
CSVI: 8.3.0
PHP: 7.4.30
Thanks!
Uli