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gestroud,
Download the full XOOPS version 2.2.3 and copy the files I was talking of.
Concerning your last point, there's no error, the file named backendt have the right name and is in the right place. This file is used to have rss feeds per topic.
You will find, on the module's homepage, a zip file containing the backend.php (withtout the final t) file alone.
bye,
Hervé