That error is implying that there is a problem with your database. There are several reasons that error can occur - when you start auto import normally do you see a lot of duplicates?
There's a box called "Duplicates" on the Auto Import tab. Does it say 0, or a number higher than that? It's in the Import Statistics section under the sites (there are also numbers for Hands and Errors).
out several lines with the same phrase in red, if you want to duplicate this, otherwise I do not understand what you mean by duplicato.scusa and thanks
I closed and then reopened the second table and continues to import only the second tavolo.dopo 2 hands in the section that you say it says: Hands 2 0 Errors and 0 duplicates