QueryId is empty.

A valid domain_Stat and QueryId parameters are required; you can leave empty domain_Stat if you want to use the default dati.istat.it.

The parameter dimToSearch, if given, need to be valid for that query. If given the parameter dimToSearch you need to give also the parameter valueToSearch and a valid value for it otherwise no filter wil be executed, if empty u will be redirect to the unfiltered query.